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格式化代码

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轩辕龙儿 2022-09-19 21:59:36 +08:00
parent f85196585c
commit 7a721c901e
270 changed files with 127300 additions and 2791 deletions
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13
src/main/java/leetcode/editor/cn/ANumberAfterADoubleReversal.java
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@ -39,20 +39,21 @@
// 👍 1 👎 0
package leetcode.editor.cn;
//5963:反转两次的数字
class ANumberAfterADoubleReversal{
class ANumberAfterADoubleReversal {
public static void main(String[] args) {
//测试代码
Solution solution = new ANumberAfterADoubleReversal().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public boolean isSameAfterReversals(int num) {
return num == 0 || num % 10 > 0;
class Solution {
public boolean isSameAfterReversals(int num) {
return num == 0 || num % 10 > 0;
}
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

69
src/main/java/leetcode/editor/cn/AddTwoNumbers.java
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@ -45,53 +45,54 @@ package leetcode.editor.cn;
import com.code.leet.entiy.ListNode;
//2:两数相加
public class AddTwoNumbers{
public class AddTwoNumbers {
public static void main(String[] args) {
//测试代码
Solution solution = new AddTwoNumbers().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode() {}
* ListNode(int val) { this.val = val; }
* ListNode(int val, ListNode next) { this.val = val; this.next = next; }
* }
*/
class Solution {
public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
int sum = 0;
ListNode temp = l1;
while (temp != null) {
sum = l2 == null ? temp.val + sum : temp.val + l2.val + sum;
temp.val = sum % 10;
sum = sum / 10;
if (l2 != null && temp.next == null && l2.next == null && sum > 0) {
temp.next = new ListNode(sum);
sum = 0;
l2 = null;
} else if (l2 != null && temp.next == null && l2.next != null) {
temp.next = l2.next;
l2 = null;
} else if (l2 != null) {
l2 = l2.next;
} else {
if (temp.next == null && sum > 0) {
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode() {}
* ListNode(int val) { this.val = val; }
* ListNode(int val, ListNode next) { this.val = val; this.next = next; }
* }
*/
class Solution {
public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
int sum = 0;
ListNode temp = l1;
while (temp != null) {
sum = l2 == null ? temp.val + sum : temp.val + l2.val + sum;
temp.val = sum % 10;
sum = sum / 10;
if (l2 != null && temp.next == null && l2.next == null && sum > 0) {
temp.next = new ListNode(sum);
sum = 0;
l2 = null;
} else if (l2 != null && temp.next == null && l2.next != null) {
temp.next = l2.next;
l2 = null;
} else if (l2 != null) {
l2 = l2.next;
} else {
if (temp.next == null && sum > 0) {
temp.next = new ListNode(sum);
sum = 0;
}
l2 = null;
}
l2 = null;
temp = temp.next;
}
temp = temp.next;
return l1;
}
return l1;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

6
src/main/java/leetcode/editor/cn/AdvantageShuffle.java
View File

@ -54,13 +54,13 @@ public class AdvantageShuffle {
int[] copy = Arrays.copyOf(A, length);
Arrays.sort(copy);
int i = 0, j = 0;
while(i < A.length) {
if(copy[i] > pairs[j].getValue()){
while (i < A.length) {
if (copy[i] > pairs[j].getValue()) {
A[pairs[j].getKey()] = copy[i];
i++;
j++;
} else {
A[pairs[(A.length-1) - (i-j)].getKey()] = copy[i];
A[pairs[(A.length - 1) - (i - j)].getKey()] = copy[i];
i++;
}
}

4
src/main/java/leetcode/editor/cn/AllNodesDistanceKInBinaryTree.java
View File

@ -63,7 +63,7 @@ public class AllNodesDistanceKInBinaryTree {
* }
*/
class Solution {
// private Stack<TreeNode> stack = new Stack<>();
// private Stack<TreeNode> stack = new Stack<>();
// List<Integer> list = new ArrayList<>();
//
// public List<Integer> distanceK(TreeNode root, TreeNode target, int k) {
@ -110,7 +110,7 @@ public class AllNodesDistanceKInBinaryTree {
// dfs(root.left, index + 1, k);
// dfs(root.right, index + 1, k);
// }
Map<Integer, TreeNode> parents = new HashMap<Integer, TreeNode>();
Map<Integer, TreeNode> parents = new HashMap<Integer, TreeNode>();
List<Integer> ans = new ArrayList<Integer>();
public List<Integer> distanceK(TreeNode root, TreeNode target, int k) {

36
src/main/java/leetcode/editor/cn/ArithmeticSlicesIiSubsequence.java
View File

@ -57,34 +57,34 @@ import java.util.HashMap;
import java.util.Map;
//446:等差数列划分 II - 子序列
class ArithmeticSlicesIiSubsequence{
class ArithmeticSlicesIiSubsequence {
public static void main(String[] args) {
//测试代码
Solution solution = new ArithmeticSlicesIiSubsequence().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public int numberOfArithmeticSlices(int[] nums) {
class Solution {
public int numberOfArithmeticSlices(int[] nums) {
int count = 0;
int length = nums.length;
Map<Long, Integer>[] f = new Map[length];
for (int i = 0; i < length; ++i) {
f[i] = new HashMap<>();
}
for (int i = 0; i < length; ++i) {
for (int j = 0; j < i; ++j) {
long d = (long) nums[i] - nums[j];
int cnt = f[j].getOrDefault(d, 0);
count += cnt;
f[i].put(d, f[i].getOrDefault(d, 0) + cnt + 1);
int count = 0;
int length = nums.length;
Map<Long, Integer>[] f = new Map[length];
for (int i = 0; i < length; ++i) {
f[i] = new HashMap<>();
}
for (int i = 0; i < length; ++i) {
for (int j = 0; j < i; ++j) {
long d = (long) nums[i] - nums[j];
int cnt = f[j].getOrDefault(d, 0);
count += cnt;
f[i].put(d, f[i].getOrDefault(d, 0) + cnt + 1);
}
}
return count;
}
return count;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

6
src/main/java/leetcode/editor/cn/ArrangingCoins.java
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@ -46,12 +46,12 @@ class ArrangingCoins {
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public int arrangeCoins(long n) {
if(n==0){
if (n == 0) {
return 0;
}
double number = (Math.sqrt(1+8*n)-1)/2;
double number = (Math.sqrt(1 + 8 * n) - 1) / 2;
return (int)(Math.floor(number));
return (int) (Math.floor(number));
}
}
//leetcode submit region end(Prohibit modification and deletion)

4
src/main/java/leetcode/editor/cn/AssignCookies.java
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@ -58,11 +58,11 @@ class AssignCookies {
int gi = 0;
int si = 0;
while (gi < g.length && si < s.length) {
if(s[si]>=g[gi]){
if (s[si] >= g[gi]) {
count++;
si++;
gi++;
}else{
} else {
si++;
}
}

58
src/main/java/leetcode/editor/cn/AsteroidCollision.java
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@ -50,41 +50,41 @@ package leetcode.editor.cn;
import java.util.Stack;
public class AsteroidCollision{
public static void main(String[] args) {
Solution solution = new AsteroidCollision().new Solution();
}
public class AsteroidCollision {
public static void main(String[] args) {
Solution solution = new AsteroidCollision().new Solution();
}
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public int[] asteroidCollision(int[] asteroids) {
Stack<Integer> stack = new Stack<>();
for (int num : asteroids) {
boolean isIn = true;
while (!stack.isEmpty() && num < 0 && stack.peek() > 0) {
if (num + stack.peek() < 0) {
stack.pop();
} else if (num + stack.peek() > 0) {
isIn = false;
break;
} else {
isIn = false;
stack.pop();
break;
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public int[] asteroidCollision(int[] asteroids) {
Stack<Integer> stack = new Stack<>();
for (int num : asteroids) {
boolean isIn = true;
while (!stack.isEmpty() && num < 0 && stack.peek() > 0) {
if (num + stack.peek() < 0) {
stack.pop();
} else if (num + stack.peek() > 0) {
isIn = false;
break;
} else {
isIn = false;
stack.pop();
break;
}
}
if (isIn) {
stack.push(num);
}
}
if (isIn) {
stack.push(num);
int size = stack.size();
asteroids = new int[size];
for (int i = size - 1; i >= 0; i--) {
asteroids[i] = stack.pop();
}
return asteroids;
}
int size = stack.size();
asteroids = new int[size];
for (int i = size - 1; i >= 0; i--) {
asteroids[i] = stack.pop();
}
return asteroids;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

71
src/main/java/leetcode/editor/cn/AverageOfLevelsInBinaryTree.java
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@ -44,50 +44,51 @@ import java.util.List;
import java.util.Queue;
//637:二叉树的层平均值
public class AverageOfLevelsInBinaryTree{
public class AverageOfLevelsInBinaryTree {
public static void main(String[] args) {
Solution solution = new AverageOfLevelsInBinaryTree().new Solution();
// TO TEST
}
//leetcode submit region begin(Prohibit modification and deletion)
/**
* Definition for a binary tree node.
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNode right;
* TreeNode() {}
* TreeNode(int val) { this.val = val; }
* TreeNode(int val, TreeNode left, TreeNode right) {
* this.val = val;
* this.left = left;
* this.right = right;
* }
* }
*/
class Solution {
public List<Double> averageOfLevels(TreeNode root) {
Queue<TreeNode> queue = new LinkedList<>();
queue.add(root);
List<Double> result = new ArrayList<>();
while (!queue.isEmpty()){
int size = queue.size();
double sum = 0f;
for (int i = 0; i < size; i++) {
TreeNode node = queue.poll();
if(node.left!=null){
queue.add(node.left);
/**
* Definition for a binary tree node.
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNode right;
* TreeNode() {}
* TreeNode(int val) { this.val = val; }
* TreeNode(int val, TreeNode left, TreeNode right) {
* this.val = val;
* this.left = left;
* this.right = right;
* }
* }
*/
class Solution {
public List<Double> averageOfLevels(TreeNode root) {
Queue<TreeNode> queue = new LinkedList<>();
queue.add(root);
List<Double> result = new ArrayList<>();
while (!queue.isEmpty()) {
int size = queue.size();
double sum = 0f;
for (int i = 0; i < size; i++) {
TreeNode node = queue.poll();
if (node.left != null) {
queue.add(node.left);
}
if (node.right != null) {
queue.add(node.right);
}
sum += node.val;
}
if(node.right!=null){
queue.add(node.right);
}
sum+= node.val;
result.add(sum / size);
}
result.add(sum/size);
return result;
}
return result;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

2
src/main/java/leetcode/editor/cn/BackspaceStringCompare.java
View File

@ -83,7 +83,7 @@ public class BackspaceStringCompare {
int length = str.length();
for (char ch : str.toCharArray()) {
if (ch == '#') {
if(!stack.isEmpty()) {
if (!stack.isEmpty()) {
stack.pop();
}
} else {

61
src/main/java/leetcode/editor/cn/BalancedBinaryTree.java
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@ -45,45 +45,46 @@ package leetcode.editor.cn;
import com.code.leet.entiy.TreeNode;
//110:平衡二叉树
public class BalancedBinaryTree{
public class BalancedBinaryTree {
public static void main(String[] args) {
//测试代码
Solution solution = new BalancedBinaryTree().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
/**
* Definition for a binary tree node.
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNode right;
* TreeNode() {}
* TreeNode(int val) { this.val = val; }
* TreeNode(int val, TreeNode left, TreeNode right) {
* this.val = val;
* this.left = left;
* this.right = right;
* }
* }
*/
class Solution {
public boolean isBalanced(TreeNode root) {
if (root == null) {
return true;
} else {
return Math.abs(getHeight(root.left) - getHeight(root.right)) <= 1 && isBalanced(root.left) && isBalanced(root.right);
}
}
public int getHeight(TreeNode root) {
if (root == null) {
return 0;
} else {
return Math.max(getHeight(root.left), getHeight(root.right)) + 1;
/**
* Definition for a binary tree node.
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNode right;
* TreeNode() {}
* TreeNode(int val) { this.val = val; }
* TreeNode(int val, TreeNode left, TreeNode right) {
* this.val = val;
* this.left = left;
* this.right = right;
* }
* }
*/
class Solution {
public boolean isBalanced(TreeNode root) {
if (root == null) {
return true;
} else {
return Math.abs(getHeight(root.left) - getHeight(root.right)) <= 1 && isBalanced(root.left) && isBalanced(root.right);
}
}
public int getHeight(TreeNode root) {
if (root == null) {
return 0;
} else {
return Math.max(getHeight(root.left), getHeight(root.right)) + 1;
}
}
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

7
src/main/java/leetcode/editor/cn/BaoHanMinhanShuDeZhanLcof.java
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@ -33,14 +33,15 @@ package leetcode.editor.cn;
import java.util.Stack;
//面试题30:包含min函数的栈
public class BaoHanMinhanShuDeZhanLcof{
public class BaoHanMinhanShuDeZhanLcof {
public static void main(String[] args) {
//测试代码
// Solution solution = new BaoHanMinhanShuDeZhanLcof().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class MinStack {
class MinStack {
Stack<Integer> stack;
Stack<Integer> min;
@ -70,7 +71,7 @@ class MinStack {
public int min() {
return min.peek();
}
}
}
/**
* Your MinStack object will be instantiated and called as such:

2
src/main/java/leetcode/editor/cn/BasicCalculatorIi.java
View File

@ -63,7 +63,7 @@ public class BasicCalculatorIi {
int num = 0;
Stack<Integer> stack = new Stack<>();
char op = '+';
s=s.replace(" ","");
s = s.replace(" ", "");
for (int i = 0; i < s.length(); i++) {
char ch = s.charAt(i);
if (Character.isDigit(ch)) {

51
src/main/java/leetcode/editor/cn/BinaryTreePostorderTraversal.java
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@ -23,40 +23,41 @@ import java.util.ArrayList;
import java.util.List;
//145:二叉树的后序遍历
public class BinaryTreePostorderTraversal{
public class BinaryTreePostorderTraversal {
public static void main(String[] args) {
//测试代码
Solution solution = new BinaryTreePostorderTraversal().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
/**
* Definition for a binary tree node.
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNode right;
* TreeNode() {}
* TreeNode(int val) { this.val = val; }
* TreeNode(int val, TreeNode left, TreeNode right) {
* this.val = val;
* this.left = left;
* this.right = right;
* }
* }
*/
class Solution {
public List<Integer> postorderTraversal(TreeNode root) {
List<Integer> list = new ArrayList<>();
if(root==null){
/**
* Definition for a binary tree node.
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNode right;
* TreeNode() {}
* TreeNode(int val) { this.val = val; }
* TreeNode(int val, TreeNode left, TreeNode right) {
* this.val = val;
* this.left = left;
* this.right = right;
* }
* }
*/
class Solution {
public List<Integer> postorderTraversal(TreeNode root) {
List<Integer> list = new ArrayList<>();
if (root == null) {
return list;
}
list.addAll(postorderTraversal(root.left));
list.addAll(postorderTraversal(root.right));
list.add(root.val);
return list;
}
list.addAll(postorderTraversal(root.left));
list.addAll(postorderTraversal(root.right));
list.add(root.val);
return list;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

5
src/main/java/leetcode/editor/cn/BinaryTreeZigzagLevelOrderTraversal.java
View File

@ -34,7 +34,7 @@ public class BinaryTreeZigzagLevelOrderTraversal {
public static void main(String[] args) {
//测试代码
Solution solution = new BinaryTreeZigzagLevelOrderTraversal().new Solution();
List<Integer> list = Arrays.asList(3,9,20,null,null,15,7);
List<Integer> list = Arrays.asList(3, 9, 20, null, null, 15, 7);
solution.zigzagLevelOrder(new TreeNode(list));
}
//力扣代码
@ -56,7 +56,8 @@ public class BinaryTreeZigzagLevelOrderTraversal {
* }
*/
class Solution {
public List<List<Integer>> zigzagLevelOrder(TreeNode root) {List<List<Integer>> ans = new LinkedList<List<Integer>>();
public List<List<Integer>> zigzagLevelOrder(TreeNode root) {
List<List<Integer>> ans = new LinkedList<List<Integer>>();
if (root == null) {
return ans;
}

66
src/main/java/leetcode/editor/cn/BooleanEvaluationLcci.java
View File

@ -26,51 +26,53 @@
// 👍 43 👎 0
package leetcode.editor.cn;
//面试题 08.14:布尔运算
public class BooleanEvaluationLcci{
public class BooleanEvaluationLcci {
public static void main(String[] args) {
//测试代码
Solution solution = new BooleanEvaluationLcci().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public int countEval(String s, int result) {
if (s.length() == 0) {
return 0;
}
if (s.length() == 1) {
return (s.charAt(0) - '0') == result ? 1 : 0;
}
char[] ch = s.toCharArray();
int[][][] dp = new int[ch.length][ch.length][2];
for (int i = 0; i < ch.length; i++) {
if (ch[i] == '0' || ch[i] == '1') {
dp[i][i][ch[i] - '0'] = 1;
class Solution {
public int countEval(String s, int result) {
if (s.length() == 0) {
return 0;
}
}
for (int len = 2; len <= ch.length; len += 2) {
for (int start = 0; start <= ch.length - len; start += 2) {
int end = start + len;
for (int k = start + 1; k <= end - 1; k += 2) {
if (ch[k] == '&') {
dp[start][end][0] += dp[start][k - 1][0] * dp[k + 1][end][0] + dp[start][k - 1][0] * dp[k + 1][end][1] + dp[start][k - 1][1] * dp[k + 1][end][0];
dp[start][end][1] += dp[start][k - 1][1] * dp[k + 1][end][1];
}
if (ch[k] == '|') {
dp[start][end][0] += dp[start][k - 1][0] * dp[k + 1][end][0];
dp[start][end][1] += dp[start][k - 1][0] * dp[k + 1][end][1] + dp[start][k - 1][1] * dp[k + 1][end][0] + dp[start][k - 1][1] * dp[k + 1][end][1];
}
if (ch[k] == '^') {
dp[start][end][0] += dp[start][k - 1][0] * dp[k + 1][end][0] + dp[start][k - 1][1] * dp[k + 1][end][1];
dp[start][end][1] += dp[start][k - 1][1] * dp[k + 1][end][0] + dp[start][k - 1][0] * dp[k + 1][end][1];
if (s.length() == 1) {
return (s.charAt(0) - '0') == result ? 1 : 0;
}
char[] ch = s.toCharArray();
int[][][] dp = new int[ch.length][ch.length][2];
for (int i = 0; i < ch.length; i++) {
if (ch[i] == '0' || ch[i] == '1') {
dp[i][i][ch[i] - '0'] = 1;
}
}
for (int len = 2; len <= ch.length; len += 2) {
for (int start = 0; start <= ch.length - len; start += 2) {
int end = start + len;
for (int k = start + 1; k <= end - 1; k += 2) {
if (ch[k] == '&') {
dp[start][end][0] += dp[start][k - 1][0] * dp[k + 1][end][0] + dp[start][k - 1][0] * dp[k + 1][end][1] + dp[start][k - 1][1] * dp[k + 1][end][0];
dp[start][end][1] += dp[start][k - 1][1] * dp[k + 1][end][1];
}
if (ch[k] == '|') {
dp[start][end][0] += dp[start][k - 1][0] * dp[k + 1][end][0];
dp[start][end][1] += dp[start][k - 1][0] * dp[k + 1][end][1] + dp[start][k - 1][1] * dp[k + 1][end][0] + dp[start][k - 1][1] * dp[k + 1][end][1];
}
if (ch[k] == '^') {
dp[start][end][0] += dp[start][k - 1][0] * dp[k + 1][end][0] + dp[start][k - 1][1] * dp[k + 1][end][1];
dp[start][end][1] += dp[start][k - 1][1] * dp[k + 1][end][0] + dp[start][k - 1][0] * dp[k + 1][end][1];
}
}
}
}
return dp[0][ch.length - 1][result];
}
return dp[0][ch.length - 1][result];
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

2
src/main/java/leetcode/editor/cn/BuildAnArrayWithStackOperations.java
View File

@ -89,7 +89,7 @@ public class BuildAnArrayWithStackOperations {
if (!stack.isEmpty() && stack.peek() == i) {
list.add("Push");
stack.pop();
if(stack.isEmpty()){
if (stack.isEmpty()) {
break;
}
} else {

21
src/main/java/leetcode/editor/cn/BuildArrayFromPermutation.java
View File

@ -38,25 +38,26 @@
// Related Topics 数组 模拟 👍 2 👎 0
package leetcode.editor.cn;
//1920:基于排列构建数组
class BuildArrayFromPermutation{
class BuildArrayFromPermutation {
public static void main(String[] args) {
//测试代码
Solution solution = new BuildArrayFromPermutation().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public int[] buildArray(int[] nums) {
int size = nums.length;
int[] arr = new int[size];
for (int i = 0; i < size; i++) {
arr[i] = nums[nums[i]];
class Solution {
public int[] buildArray(int[] nums) {
int size = nums.length;
int[] arr = new int[size];
for (int i = 0; i < size; i++) {
arr[i] = nums[nums[i]];
}
return arr;
}
return arr;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

2
src/main/java/leetcode/editor/cn/Ccw6C7.java
View File

@ -44,7 +44,7 @@ public class Ccw6C7 {
public static void main(String[] args) {
//测试代码
Solution solution = new Ccw6C7().new Solution();
solution.paintingPlan(2,2);
solution.paintingPlan(2, 2);
}
//力扣代码

2
src/main/java/leetcode/editor/cn/CheapestFlightsWithinKStops.java
View File

@ -98,7 +98,7 @@ class CheapestFlightsWithinKStops {
if (arr[0] != dst) {
use.add(arr[0]);
queue.add(new QueueEntity(arr[0], queueEntity.sum + arr[1], use));
use.remove((Integer)arr[0]);
use.remove((Integer) arr[0]);
}
sums[arr[0]] = queueEntity.sum + arr[1];
}

43
src/main/java/leetcode/editor/cn/CheckIfAParenthesesStringCanBeValid.java
View File

@ -58,38 +58,39 @@
// 👍 4 👎 0
package leetcode.editor.cn;
//5948:判断一个括号字符串是否有效
class CheckIfAParenthesesStringCanBeValid{
class CheckIfAParenthesesStringCanBeValid {
public static void main(String[] args) {
//测试代码
Solution solution = new CheckIfAParenthesesStringCanBeValid().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public boolean canBeValid(String s, String locked) {
int n = s.length();
int min = 0;
int max = 0;
for (int i = 0; i < n; i++) {
if (locked.charAt(i) == '0') {
min = Math.max(min - 1, 0);
max += 1;
} else if (s.charAt(i) == '(') {
min += 1;
max += 1;
} else {
min = Math.max(min - 1, 0);
max -= 1;
if (max < 0) {
return false;
class Solution {
public boolean canBeValid(String s, String locked) {
int n = s.length();
int min = 0;
int max = 0;
for (int i = 0; i < n; i++) {
if (locked.charAt(i) == '0') {
min = Math.max(min - 1, 0);
max += 1;
} else if (s.charAt(i) == '(') {
min += 1;
max += 1;
} else {
min = Math.max(min - 1, 0);
max -= 1;
if (max < 0) {
return false;
}
}
}
return min == 0 && max % 2 == 0;
}
return min == 0 && max % 2 == 0;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

29
src/main/java/leetcode/editor/cn/CheckIfAllCharactersHaveEqualNumberOfOccurrences.java
View File

@ -30,30 +30,31 @@
// Related Topics 哈希表 字符串 计数 👍 0 👎 0
package leetcode.editor.cn;
//1941:检查是否所有字符出现次数相同
class CheckIfAllCharactersHaveEqualNumberOfOccurrences{
class CheckIfAllCharactersHaveEqualNumberOfOccurrences {
public static void main(String[] args) {
//测试代码
Solution solution = new CheckIfAllCharactersHaveEqualNumberOfOccurrences().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public boolean areOccurrencesEqual(String s) {
int[] arr = new int[26];
for (char ch : s.toCharArray()) {
arr[ch - 'a']++;
}
int num = arr[s.charAt(0) - 'a'];
for (int j : arr) {
if (j > 0 && j != num) {
return false;
class Solution {
public boolean areOccurrencesEqual(String s) {
int[] arr = new int[26];
for (char ch : s.toCharArray()) {
arr[ch - 'a']++;
}
int num = arr[s.charAt(0) - 'a'];
for (int j : arr) {
if (j > 0 && j != num) {
return false;
}
}
return true;
}
return true;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

2
src/main/java/leetcode/editor/cn/CheckIfItIsAStraightLine.java
View File

@ -40,7 +40,7 @@ public class CheckIfItIsAStraightLine {
public static void main(String[] args) {
Solution solution = new CheckIfItIsAStraightLine().new Solution();
// TO TEST
TwoArray twoArray = new TwoArray("[[0,1],[1,3],[-4,-7],[5,11]]",true);
TwoArray twoArray = new TwoArray("[[0,1],[1,3],[-4,-7],[5,11]]", true);
System.out.println(solution.checkStraightLine(twoArray.getArr()));
}

23
src/main/java/leetcode/editor/cn/CheckIfTheSentenceIsPangram.java
View File

@ -38,26 +38,27 @@ import java.util.ArrayList;
import java.util.List;
//1832:判断句子是否为全字母句
public class CheckIfTheSentenceIsPangram{
public class CheckIfTheSentenceIsPangram {
public static void main(String[] args) {
//测试代码
Solution solution = new CheckIfTheSentenceIsPangram().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public boolean checkIfPangram(String sentence) {
List<Character> list = new ArrayList<>();
int num = 0;
for (char ch : sentence.toCharArray()) {
if (ch >= 'a' && ch <= 'z' && !list.contains(ch)) {
list.add(ch);
num++;
class Solution {
public boolean checkIfPangram(String sentence) {
List<Character> list = new ArrayList<>();
int num = 0;
for (char ch : sentence.toCharArray()) {
if (ch >= 'a' && ch <= 'z' && !list.contains(ch)) {
list.add(ch);
num++;
}
}
return num == 26;
}
return num==26;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

8
src/main/java/leetcode/editor/cn/CheckIfWordEqualsSummationOfTwoWords.java
View File

@ -57,15 +57,17 @@
// 👍 4 👎 0
package leetcode.editor.cn;
//1880:检查某单词是否等于两单词之和
public class CheckIfWordEqualsSummationOfTwoWords{
public class CheckIfWordEqualsSummationOfTwoWords {
public static void main(String[] args) {
//测试代码
Solution solution = new CheckIfWordEqualsSummationOfTwoWords().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
class Solution {
public boolean isSumEqual(String firstWord, String secondWord, String targetWord) {
return trans(firstWord) + trans(secondWord) == trans(targetWord);
}
@ -80,7 +82,7 @@ class Solution {
}
return Integer.parseInt(numStr.toString());
}
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

25
src/main/java/leetcode/editor/cn/ChuanDiXinXi.java
View File

@ -46,27 +46,28 @@ package leetcode.editor.cn;
import java.util.*;
//LCP 07:传递信息
public class ChuanDiXinXi{
public class ChuanDiXinXi {
public static void main(String[] args) {
//测试代码
Solution solution = new ChuanDiXinXi().new Solution();
System.out.println(solution.numWays(3,new int[][]{{0,2},{2,1}},2));
System.out.println(solution.numWays(5,new int[][]{{0,2},{2,1},{3,4},{2,3},{1,4},{2,0},{0,4}},3));
System.out.println(solution.numWays(3, new int[][]{{0, 2}, {2, 1}}, 2));
System.out.println(solution.numWays(5, new int[][]{{0, 2}, {2, 1}, {3, 4}, {2, 3}, {1, 4}, {2, 0}, {0, 4}}, 3));
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public int numWays(int n, int[][] relation, int k) {
int[][] dp =new int[k+1][n];
dp[0][0] =1;
for (int i = 0; i < k; i++) {
for (int[] ints : relation) {
dp[i + 1][ints[1]] += dp[i][ints[0]];
class Solution {
public int numWays(int n, int[][] relation, int k) {
int[][] dp = new int[k + 1][n];
dp[0][0] = 1;
for (int i = 0; i < k; i++) {
for (int[] ints : relation) {
dp[i + 1][ints[1]] += dp[i][ints[0]];
}
}
return dp[k][n - 1];
}
return dp[k][n-1];
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

35
src/main/java/leetcode/editor/cn/CloneGraph.java
View File

@ -78,12 +78,12 @@ import java.util.ArrayList;
import java.util.HashMap;
//133:克隆图
class CloneGraph{
class CloneGraph {
public static void main(String[] args) {
//测试代码
Solution solution = new CloneGraph().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
/*
@ -106,26 +106,27 @@ class Node {
}
*/
class Solution {
private HashMap<Node, Node> use = new HashMap<>();
public Node cloneGraph(Node node) {
if (node == null) {
return node;
}
class Solution {
private HashMap<Node, Node> use = new HashMap<>();
if (use.containsKey(node)) {
return use.get(node);
}
public Node cloneGraph(Node node) {
if (node == null) {
return node;
}
Node cloneNode = new Node(node.val, new ArrayList());
use.put(node, cloneNode);
if (use.containsKey(node)) {
return use.get(node);
}
for (Node neighbor: node.children) {
cloneNode.children.add(cloneGraph(neighbor));
Node cloneNode = new Node(node.val, new ArrayList());
use.put(node, cloneNode);
for (Node neighbor : node.children) {
cloneNode.children.add(cloneGraph(neighbor));
}
return cloneNode;
}
return cloneNode;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

6
src/main/java/leetcode/editor/cn/CoinChange2.java
View File

@ -52,9 +52,9 @@ public class CoinChange2 {
public static void main(String[] args) {
//测试代码
Solution solution = new CoinChange2().new Solution();
System.out.println(solution.change(5,new int[]{1,2,5}));
System.out.println(solution.change(3,new int[]{2}));
System.out.println(solution.change(10,new int[]{10}));
System.out.println(solution.change(5, new int[]{1, 2, 5}));
System.out.println(solution.change(3, new int[]{2}));
System.out.println(solution.change(10, new int[]{10}));
}
//力扣代码

2
src/main/java/leetcode/editor/cn/CombinationSum.java
View File

@ -95,7 +95,7 @@ public class CombinationSum {
use.add(candidates[i]);
backtrack(candidates, i, use, sum + candidates[i], target);
use.remove(use.size() - 1);
if(bl){
if (bl) {
break;
}
}

3
src/main/java/leetcode/editor/cn/Combinations.java
View File

@ -51,7 +51,8 @@ public class Combinations {
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
List<List<Integer>> list = new ArrayList<>();
// public List<List<Integer>> combine(int n, int k) {
// public List<List<Integer>> combine(int n, int k) {
// int[] nums = new int[n];
// for (int i = 0; i < n; i++) {
// nums[i] = i + 1;

2
src/main/java/leetcode/editor/cn/CompareVersionNumbers.java
View File

@ -75,7 +75,7 @@ class CompareVersionNumbers {
public static void main(String[] args) {
//测试代码
Solution solution = new CompareVersionNumbers().new Solution();
solution.compareVersion("0.1","1.1");
solution.compareVersion("0.1", "1.1");
}
//力扣代码

47
src/main/java/leetcode/editor/cn/CongWeiDaoTouDaYinLianBiaoLcof.java
View File

@ -22,37 +22,38 @@ import java.util.ArrayList;
import java.util.List;
//剑指 Offer 06:从尾到头打印链表
class CongWeiDaoTouDaYinLianBiaoLcof{
class CongWeiDaoTouDaYinLianBiaoLcof {
public static void main(String[] args) {
//测试代码
Solution solution = new CongWeiDaoTouDaYinLianBiaoLcof().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) { val = x; }
* }
*/
class Solution {
public int[] reversePrint(ListNode head) {
List<Integer> list = new ArrayList<>();
while (head != null) {
list.add(head.val);
head = head.next;
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) { val = x; }
* }
*/
class Solution {
public int[] reversePrint(ListNode head) {
List<Integer> list = new ArrayList<>();
while (head != null) {
list.add(head.val);
head = head.next;
}
int size = list.size();
int[] arr = new int[size];
for (int i = size - 1; i >= 0; i--) {
arr[i] = list.get(size - 1 - i);
}
return arr;
}
int size = list.size();
int[] arr = new int[size];
for (int i = size - 1; i >= 0; i--) {
arr[i] = list.get(size - 1 - i);
}
return arr;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

2
src/main/java/leetcode/editor/cn/ContainsDuplicate.java
View File

@ -54,7 +54,7 @@ class ContainsDuplicate {
public boolean containsDuplicate(int[] nums) {
Arrays.sort(nums);
for (int i = 1; i < nums.length; i++) {
if(nums[i]==nums[i-1]){
if (nums[i] == nums[i - 1]) {
return true;
}
}

37
src/main/java/leetcode/editor/cn/ConvertBinaryNumberInALinkedListToInteger.java
View File

@ -54,32 +54,33 @@ package leetcode.editor.cn;
import com.code.leet.entiy.ListNode;
//1290:二进制链表转整数
public class ConvertBinaryNumberInALinkedListToInteger{
public class ConvertBinaryNumberInALinkedListToInteger {
public static void main(String[] args) {
//测试代码
Solution solution = new ConvertBinaryNumberInALinkedListToInteger().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) { val = x; }
* }
*/
class Solution {
public int getDecimalValue(ListNode head) {
int num = 0;
while (head != null) {
num <<= 1;
num |= head.val;
head = head.next;
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) { val = x; }
* }
*/
class Solution {
public int getDecimalValue(ListNode head) {
int num = 0;
while (head != null) {
num <<= 1;
num |= head.val;
head = head.next;
}
return num;
}
return num;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

59
src/main/java/leetcode/editor/cn/ConvertSortedArrayToBinarySearchTree.java
View File

@ -38,46 +38,47 @@ package leetcode.editor.cn;
import com.code.leet.entiy.TreeNode;
//108:将有序数组转换为二叉搜索树
class ConvertSortedArrayToBinarySearchTree{
class ConvertSortedArrayToBinarySearchTree {
public static void main(String[] args) {
//测试代码
Solution solution = new ConvertSortedArrayToBinarySearchTree().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
/**
* Definition for a binary tree node.
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNode right;
* TreeNode() {}
* TreeNode(int val) { this.val = val; }
* TreeNode(int val, TreeNode left, TreeNode right) {
* this.val = val;
* this.left = left;
* this.right = right;
* }
* }
*/
class Solution {
public TreeNode sortedArrayToBST(int[] nums) {
return sortedArrayToBST(nums, 0, nums.length);
}
/**
* Definition for a binary tree node.
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNode right;
* TreeNode() {}
* TreeNode(int val) { this.val = val; }
* TreeNode(int val, TreeNode left, TreeNode right) {
* this.val = val;
* this.left = left;
* this.right = right;
* }
* }
*/
class Solution {
private TreeNode sortedArrayToBST(int[] nums, int start, int end) {
if (start == end) {
return null;
public TreeNode sortedArrayToBST(int[] nums) {
return sortedArrayToBST(nums, 0, nums.length);
}
int mid = (start + end) >>> 1;
TreeNode root = new TreeNode(nums[mid]);
root.left = sortedArrayToBST(nums, start, mid);
root.right = sortedArrayToBST(nums, mid + 1, end);
return root;
private TreeNode sortedArrayToBST(int[] nums, int start, int end) {
if (start == end) {
return null;
}
int mid = (start + end) >>> 1;
TreeNode root = new TreeNode(nums[mid]);
root.left = sortedArrayToBST(nums, start, mid);
root.right = sortedArrayToBST(nums, mid + 1, end);
return root;
}
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

36
src/main/java/leetcode/editor/cn/CopyListWithRandomPointer.java
View File

@ -74,7 +74,7 @@ import java.util.HashMap;
import java.util.Map;
//138:复制带随机指针的链表
public class CopyListWithRandomPointer{
public class CopyListWithRandomPointer {
public static void main(String[] args) {
//测试代码
Solution solution = new CopyListWithRandomPointer().new Solution();
@ -96,26 +96,26 @@ class Node {
}
*/
class Solution {
public Node copyRandomList(Node head) {
Map<Node, Node> map = new HashMap<>();
return copy(head, map);
}
class Solution {
public Node copyRandomList(Node head) {
Map<Node, Node> map = new HashMap<>();
return copy(head, map);
}
private Node copy(Node head, Map<Node, Node> map) {
if (head == null) {
return null;
private Node copy(Node head, Map<Node, Node> map) {
if (head == null) {
return null;
}
if (map.containsKey(head)) {
return map.get(head);
}
Node node = new Node(head.val);
map.put(head, node);
node.next = copy(head.next, map);
node.random = copy(head.random, map);
return node;
}
if (map.containsKey(head)) {
return map.get(head);
}
Node node = new Node(head.val);
map.put(head, node);
node.next = copy(head.next, map);
node.random = copy(head.random, map);
return node;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

21
src/main/java/leetcode/editor/cn/CorporateFlightBookings.java
View File

@ -48,26 +48,27 @@
// Related Topics 数组 前缀和 👍 218 👎 0
package leetcode.editor.cn;
//1109:航班预订统计
class CorporateFlightBookings{
class CorporateFlightBookings {
public static void main(String[] args) {
//测试代码
Solution solution = new CorporateFlightBookings().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public int[] corpFlightBookings(int[][] bookings, int n) {
int[] result = new int[n];
for (int[] booking : bookings) {
for (int j = booking[0] - 1; j < booking[1]; j++) {
result[j] += booking[2];
class Solution {
public int[] corpFlightBookings(int[][] bookings, int n) {
int[] result = new int[n];
for (int[] booking : bookings) {
for (int j = booking[0] - 1; j < booking[1]; j++) {
result[j] += booking[2];
}
}
return result;
}
return result;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

14
src/main/java/leetcode/editor/cn/CountNicePairsInAnArray.java
View File

@ -42,14 +42,15 @@ import java.util.HashMap;
import java.util.Map;
//1814:统计一个数组中好对子的数目
public class CountNicePairsInAnArray{
public class CountNicePairsInAnArray {
public static void main(String[] args) {
//测试代码
Solution solution = new CountNicePairsInAnArray().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
class Solution {
public int countNicePairs(int[] nums) {
Map<Integer, Long> map = new HashMap<>();
for (int num : nums) {
@ -67,14 +68,15 @@ class Solution {
count += value * (value - 1) / 2;
}
}
return (int)(count % (Math.pow(10, 9) + 7));
return (int) (count % (Math.pow(10, 9) + 7));
}
private int revert(int num){
String str = ""+num;
private int revert(int num) {
String str = "" + num;
str = new StringBuilder(str).reverse().toString();
return Integer.parseInt(str);
}
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

2
src/main/java/leetcode/editor/cn/CountOfSmallerNumbersAfterSelf.java
View File

@ -34,7 +34,7 @@ class CountOfSmallerNumbersAfterSelf {
public static void main(String[] args) {
//测试代码
Solution solution = new CountOfSmallerNumbersAfterSelf().new Solution();
System.out.println(solution.countSmaller(new int[]{1,-3,-2}));
System.out.println(solution.countSmaller(new int[]{1, -3, -2}));
}
//力扣代码

27
src/main/java/leetcode/editor/cn/CountSquareSumTriples.java
View File

@ -28,31 +28,32 @@
// Related Topics 数学 枚举 👍 5 👎 0
package leetcode.editor.cn;
//1925:统计平方和三元组的数目
class CountSquareSumTriples{
class CountSquareSumTriples {
public static void main(String[] args) {
//测试代码
Solution solution = new CountSquareSumTriples().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public int countTriples(int n) {
int count = 0;
for (int i = n; i > 0; i--) {
for (int j = i - 1; j > 0; j--) {
int sum = i * i - j * j;
int num = (int) Math.sqrt(sum);
if (sum == num * num) {
count++;
class Solution {
public int countTriples(int n) {
int count = 0;
for (int i = n; i > 0; i--) {
for (int j = i - 1; j > 0; j--) {
int sum = i * i - j * j;
int num = (int) Math.sqrt(sum);
if (sum == num * num) {
count++;
}
}
}
return count;
}
return count;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

6
src/main/java/leetcode/editor/cn/CountVowelsPermutation.java
View File

@ -56,11 +56,11 @@ public class CountVowelsPermutation {
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public int countVowelPermutation(int n) {
int mod = (int)(1e9+7);
int mod = (int) (1e9 + 7);
long[][] nums = new long[n][5];
Arrays.fill(nums[0], 1);
for (int i = 1; i < n; i++) {
nums[i][0] = (nums[i - 1][1] + nums[i - 1][2]+nums[i-1][4]) % mod;
nums[i][0] = (nums[i - 1][1] + nums[i - 1][2] + nums[i - 1][4]) % mod;
nums[i][1] = (nums[i - 1][0] + nums[i - 1][2]) % mod;
nums[i][2] = (nums[i - 1][1] + nums[i - 1][3]) % mod;
nums[i][3] = nums[i - 1][2];
@ -70,7 +70,7 @@ public class CountVowelsPermutation {
for (int i = 0; i < 5; i++) {
result += nums[n - 1][i];
}
return (int)(result % mod);
return (int) (result % mod);
}
}
//leetcode submit region end(Prohibit modification and deletion)

2
src/main/java/leetcode/editor/cn/CountingBits.java
View File

@ -62,7 +62,7 @@ public class CountingBits {
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public int[] countBits(int n) {
int[] arrs = new int[n+1];
int[] arrs = new int[n + 1];
for (int i = 0; i <= n; i++) {
arrs[i] = Integer.bitCount(i);
}

8
src/main/java/leetcode/editor/cn/CousinsInBinaryTree.java
View File

@ -75,11 +75,11 @@ public class CousinsInBinaryTree {
*/
class Solution {
public boolean isCousins(TreeNode root, int x, int y) {
int[][] paraent = getParent(root, x, y, new int[2][2], 1,-1);
int[][] paraent = getParent(root, x, y, new int[2][2], 1, -1);
return paraent[0][0] != paraent[1][0] && paraent[0][1] == paraent[1][1];
}
private int[][] getParent(TreeNode root, int x, int y, int[][] paraent, int deep,int before) {
private int[][] getParent(TreeNode root, int x, int y, int[][] paraent, int deep, int before) {
if (paraent[1][1] > 0) {
return paraent;
}
@ -95,13 +95,13 @@ public class CousinsInBinaryTree {
}
}
if (root.left != null) {
paraent = getParent(root.left, x, y, paraent, deep + 1,root.val);
paraent = getParent(root.left, x, y, paraent, deep + 1, root.val);
}
if (paraent[1][1] > 0) {
return paraent;
}
if (root.right != null) {
paraent = getParent(root.right, x, y, paraent, deep + 1,root.val);
paraent = getParent(root.right, x, y, paraent, deep + 1, root.val);
}
return paraent;
}

10
src/main/java/leetcode/editor/cn/CutOffTreesForGolfEvent.java
View File

@ -63,11 +63,11 @@ public class CutOffTreesForGolfEvent {
Solution solution = new CutOffTreesForGolfEvent().new Solution();
// TO TEST
List<List<Integer>> forest = Arrays.asList(
Arrays.asList(54581641,64080174,24346381,69107959)
, Arrays.asList(86374198,61363882,68783324,79706116)
, Arrays.asList(668150, 92178815,89819108,94701471)
, Arrays.asList(83920491,22724204,46281641,47531096)
, Arrays.asList(89078499,18904913,25462145,60813308));
Arrays.asList(54581641, 64080174, 24346381, 69107959)
, Arrays.asList(86374198, 61363882, 68783324, 79706116)
, Arrays.asList(668150, 92178815, 89819108, 94701471)
, Arrays.asList(83920491, 22724204, 46281641, 47531096)
, Arrays.asList(89078499, 18904913, 25462145, 60813308));
solution.cutOffTree(forest);
}

2
src/main/java/leetcode/editor/cn/DecodedStringAtIndex.java
View File

@ -100,7 +100,7 @@ public class DecodedStringAtIndex {
}
}
for (int i = length-1; i >= 0; --i) {
for (int i = length - 1; i >= 0; --i) {
K %= size;
if (K == 0 && Character.isLetter(S.charAt(i))) {
return Character.toString(S.charAt(i));

2
src/main/java/leetcode/editor/cn/DeleteColumnsToMakeSorted.java
View File

@ -74,7 +74,7 @@ public class DeleteColumnsToMakeSorted {
int count = 0;
for (int i = 0; i < strs[0].length(); i++) {
for (int j = 1; j < strs.length; j++) {
if(strs[j].charAt(i)<strs[j-1].charAt(i)){
if (strs[j].charAt(i) < strs[j - 1].charAt(i)) {
count++;
break;
}

29
src/main/java/leetcode/editor/cn/DeleteMiddleNodeLcci.java
View File

@ -22,27 +22,28 @@ package leetcode.editor.cn;
import com.code.leet.entiy.ListNode;
//面试题 02.03:删除中间节点
public class DeleteMiddleNodeLcci{
public class DeleteMiddleNodeLcci {
public static void main(String[] args) {
//测试代码
Solution solution = new DeleteMiddleNodeLcci().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) { val = x; }
* }
*/
class Solution {
public void deleteNode(ListNode node) {
node.val = node.next.val;
node.next = node.next.next;
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) { val = x; }
* }
*/
class Solution {
public void deleteNode(ListNode node) {
node.val = node.next.val;
node.next = node.next.next;
}
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

29
src/main/java/leetcode/editor/cn/DeleteNodeInALinkedList.java
View File

@ -40,27 +40,28 @@ package leetcode.editor.cn;
import com.code.leet.entiy.ListNode;
//237:删除链表中的节点
public class DeleteNodeInALinkedList{
public class DeleteNodeInALinkedList {
public static void main(String[] args) {
//测试代码
Solution solution = new DeleteNodeInALinkedList().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) { val = x; }
* }
*/
class Solution {
public void deleteNode(ListNode node) {
node.val = node.next.val;
node.next = node.next.next;
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) { val = x; }
* }
*/
class Solution {
public void deleteNode(ListNode node) {
node.val = node.next.val;
node.next = node.next.next;
}
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

2
src/main/java/leetcode/editor/cn/DesignAStackWithIncrementOperation.java
View File

@ -82,7 +82,7 @@ public class DesignAStackWithIncrementOperation {
}
public int pop() {
if(index==0){
if (index == 0) {
return -1;
}
index--;

11
src/main/java/leetcode/editor/cn/DesignAuthenticationManager.java
View File

@ -69,14 +69,15 @@ import java.util.HashMap;
import java.util.Map;
//1797:设计一个验证系统
public class DesignAuthenticationManager{
public class DesignAuthenticationManager {
public static void main(String[] args) {
//测试代码
// Solution solution = new DesignAuthenticationManager().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class AuthenticationManager {
class AuthenticationManager {
Map<String, Integer> map = new HashMap<>();
int timeToLive;
@ -96,14 +97,14 @@ class AuthenticationManager {
public int countUnexpiredTokens(int currentTime) {
int num = 0;
for (String key:map.keySet()) {
if(map.get(key)>currentTime){
for (String key : map.keySet()) {
if (map.get(key) > currentTime) {
num++;
}
}
return num;
}
}
}
/**
* Your AuthenticationManager object will be instantiated and called as such:

6
src/main/java/leetcode/editor/cn/DesignFrontMiddleBackQueue.java
View File

@ -82,7 +82,7 @@ public class DesignFrontMiddleBackQueue {
}
public void pushMiddle(int val) {
list.add(list.size()/2, val);
list.add(list.size() / 2, val);
}
public void pushBack(int val) {
@ -100,14 +100,14 @@ public class DesignFrontMiddleBackQueue {
if (list.isEmpty()) {
return -1;
}
return list.remove((list.size()-1) / 2);
return list.remove((list.size() - 1) / 2);
}
public int popBack() {
if (list.isEmpty()) {
return -1;
}
return list.remove(list.size()-1);
return list.remove(list.size() - 1);
}
}

57
src/main/java/leetcode/editor/cn/DesignHashset.java
View File

@ -51,46 +51,51 @@ import java.util.ArrayList;
import java.util.List;
//705:设计哈希集合
public class DesignHashset{
public class DesignHashset {
public static void main(String[] args) {
//测试代码
// Solution solution = new DesignHashset().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class MyHashSet {
class MyHashSet {
List<Integer> list;
/** Initialize your data structure here. */
public MyHashSet() {
list = new ArrayList<>();
}
public void add(int key) {
if(list.contains(key)){
return;
/**
* Initialize your data structure here.
*/
public MyHashSet() {
list = new ArrayList<>();
}
list.add(key);
}
public void remove(int key) {
for (int i = 0; i < list.size(); i++) {
if(list.get(i)==key){
list.remove(i);
public void add(int key) {
if (list.contains(key)) {
return;
}
list.add(key);
}
public void remove(int key) {
for (int i = 0; i < list.size(); i++) {
if (list.get(i) == key) {
list.remove(i);
}
}
}
}
/** Returns true if this set contains the specified element */
public boolean contains(int key) {
for (int i = 0; i < list.size(); i++) {
if(list.get(i)==key){
return true;
/**
* Returns true if this set contains the specified element
*/
public boolean contains(int key) {
for (int i = 0; i < list.size(); i++) {
if (list.get(i) == key) {
return true;
}
}
return false;
}
return false;
}
}
/**
* Your MyHashSet object will be instantiated and called as such:

2
src/main/java/leetcode/editor/cn/DestinationCity.java
View File

@ -68,7 +68,7 @@ class DestinationCity {
for (List<String> path : paths) {
if (!use.contains(path.get(1))) {
result.add(path.get(1));
}else {
} else {
use.remove(path.get(1));
}
if (!result.contains(path.get(0))) {

20
src/main/java/leetcode/editor/cn/DetermineColorOfAChessboardSquare.java
View File

@ -44,24 +44,26 @@
// 👍 4 👎 0
package leetcode.editor.cn;
//1812:判断国际象棋棋盘中一个格子的颜色
public class DetermineColorOfAChessboardSquare{
public class DetermineColorOfAChessboardSquare {
public static void main(String[] args) {
//测试代码
Solution solution = new DetermineColorOfAChessboardSquare().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public boolean squareIsWhite(String coordinates) {
char[] chars = coordinates.toCharArray();
if ((chars[0] - chars[1]) % 2 == 0) {
return false;
} else {
return true;
class Solution {
public boolean squareIsWhite(String coordinates) {
char[] chars = coordinates.toCharArray();
if ((chars[0] - chars[1]) % 2 == 0) {
return false;
} else {
return true;
}
}
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

50
src/main/java/leetcode/editor/cn/EliminateMaximumNumberOfMonsters.java
View File

@ -65,40 +65,40 @@ import java.util.HashMap;
import java.util.Map;
//1921:消灭怪物的最大数量
class EliminateMaximumNumberOfMonsters{
class EliminateMaximumNumberOfMonsters {
public static void main(String[] args) {
//测试代码
Solution solution = new EliminateMaximumNumberOfMonsters().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public int eliminateMaximum(int[] dist, int[] speed) {
int size = dist.length;
int[] times = new int[size];
for (int i = 0; i < size; i++) {
int time = dist[i] / speed[i];
times[i] = dist[i] % speed[i] == 0 ? time - 1 : time;
}
Arrays.sort(times);
Map<Integer, Integer> map = new HashMap<>();
for (int i = 0; i < size; i++) {
map.put(times[i], map.getOrDefault(times[i], 0) + 1);
}
int index = 1;
for (int i = 0; i < size; i++) {
if(map.containsKey(i)){
if(map.get(i)>index){
return i+1;
}
index-=map.get(i);
class Solution {
public int eliminateMaximum(int[] dist, int[] speed) {
int size = dist.length;
int[] times = new int[size];
for (int i = 0; i < size; i++) {
int time = dist[i] / speed[i];
times[i] = dist[i] % speed[i] == 0 ? time - 1 : time;
}
index++;
Arrays.sort(times);
Map<Integer, Integer> map = new HashMap<>();
for (int i = 0; i < size; i++) {
map.put(times[i], map.getOrDefault(times[i], 0) + 1);
}
int index = 1;
for (int i = 0; i < size; i++) {
if (map.containsKey(i)) {
if (map.get(i) > index) {
return i + 1;
}
index -= map.get(i);
}
index++;
}
return size;
}
return size;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

34
src/main/java/leetcode/editor/cn/EmployeeImportance.java
View File

@ -38,7 +38,7 @@ import java.util.List;
import java.util.Map;
//690:员工的重要性
public class EmployeeImportance{
public class EmployeeImportance {
public static void main(String[] args) {
//测试代码
Solution solution = new EmployeeImportance().new Solution();
@ -54,24 +54,26 @@ class Employee {
};
*/
class Solution {
Map<Integer,Employee> map = new HashMap<>();
public int getImportance(List<Employee> employees, int id) {
for(Employee employee:employees){
map.put(employee.id,employee);
class Solution {
Map<Integer, Employee> map = new HashMap<>();
public int getImportance(List<Employee> employees, int id) {
for (Employee employee : employees) {
map.put(employee.id, employee);
}
return dfs(id);
}
return dfs(id);
}
private int dfs(int id){
Employee employee = map.get(id);
int total = employee.importance;
List<Integer> subordinates = employee.subordinates;
for(int subordinaty:subordinates){
total+=dfs(subordinaty);
private int dfs(int id) {
Employee employee = map.get(id);
int total = employee.importance;
List<Integer> subordinates = employee.subordinates;
for (int subordinaty : subordinates) {
total += dfs(subordinaty);
}
return total;
}
return total;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

56
src/main/java/leetcode/editor/cn/EvaluateReversePolishNotation.java
View File

@ -88,37 +88,37 @@ public class EvaluateReversePolishNotation {
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public int evalRPN(String[] tokens) {
Stack<Integer> stack = new Stack<>();
String op = "+-*/";
int result = 0;
for (String str : tokens) {
if (op.contains(str) && !stack.isEmpty()) {
int op2 = stack.pop();
int op1 = stack.pop();
switch (str) {
case "+":
result = op1 + op2;
break;
case "-":
result = op1 - op2;
break;
case "*":
result = op1 * op2;
break;
case "/":
result = op1 / op2;
break;
default:
break;
}
stack.push(result);
} else {
stack.push(Integer.valueOf(str));
public int evalRPN(String[] tokens) {
Stack<Integer> stack = new Stack<>();
String op = "+-*/";
int result = 0;
for (String str : tokens) {
if (op.contains(str) && !stack.isEmpty()) {
int op2 = stack.pop();
int op1 = stack.pop();
switch (str) {
case "+":
result = op1 + op2;
break;
case "-":
result = op1 - op2;
break;
case "*":
result = op1 * op2;
break;
case "/":
result = op1 / op2;
break;
default:
break;
}
stack.push(result);
} else {
stack.push(Integer.valueOf(str));
}
return stack.pop();
}
return stack.pop();
}
}
//leetcode submit region end(Prohibit modification and deletion)

2
src/main/java/leetcode/editor/cn/ExcelSheetColumnTitle.java
View File

@ -48,7 +48,7 @@ public class ExcelSheetColumnTitle {
StringBuilder result = new StringBuilder();
while (columnNumber > 0) {
int num = (columnNumber - 1) % 26 + 1;
result.insert(0, (char)((num - 1) + 'A'));
result.insert(0, (char) ((num - 1) + 'A'));
columnNumber = (columnNumber - num) / 26;
}
return result.toString();

47
src/main/java/leetcode/editor/cn/FanZhuanLianBiaoLcof.java
View File

@ -24,38 +24,39 @@ package leetcode.editor.cn;
import com.code.leet.entiy.ListNode;
//剑指 Offer 24:反转链表
public class FanZhuanLianBiaoLcof{
public class FanZhuanLianBiaoLcof {
public static void main(String[] args) {
//测试代码
Solution solution = new FanZhuanLianBiaoLcof().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) { val = x; }
* }
*/
class Solution {
public ListNode reverseList(ListNode head) {
ListNode newHead = null;
ListNode p = head;
ListNode pPrev = null;
while (p != null) {
ListNode temp = p.next;
if (temp == null) {
newHead = p;
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) { val = x; }
* }
*/
class Solution {
public ListNode reverseList(ListNode head) {
ListNode newHead = null;
ListNode p = head;
ListNode pPrev = null;
while (p != null) {
ListNode temp = p.next;
if (temp == null) {
newHead = p;
}
p.next = pPrev;
pPrev = p;
p = temp;
}
p.next = pPrev;
pPrev = p;
p = temp;
return newHead;
}
return newHead;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

2
src/main/java/leetcode/editor/cn/FindAllAnagramsInAString.java
View File

@ -54,7 +54,7 @@ class FindAllAnagramsInAString {
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public List<Integer> findAnagrams(String s, String p) {
if(p.length()>s.length()){
if (p.length() > s.length()) {
return new ArrayList<>();
}
int[] pchs = new int[26];

4
src/main/java/leetcode/editor/cn/FindFirstAndLastPositionOfElementInSortedArray.java
View File

@ -48,7 +48,7 @@ public class FindFirstAndLastPositionOfElementInSortedArray {
public static void main(String[] args) {
//测试代码
Solution solution = new FindFirstAndLastPositionOfElementInSortedArray().new Solution();
solution.searchRange(new int[]{5,7,7,8,8,10},8);//3,4
solution.searchRange(new int[]{5, 7, 7, 8, 8, 10}, 8);//3,4
solution.searchRange(new int[]{5, 7, 7, 8, 8, 10}, 6);//-1,-1
solution.searchRange(new int[]{2, 2}, 3);//-1,-1
solution.searchRange(new int[]{1, 4}, 4);//1,1
@ -92,7 +92,7 @@ public class FindFirstAndLastPositionOfElementInSortedArray {
mid /= 2;
}
}
if(nums[mid] == target){
if (nums[mid] == target) {
break;
}
}

31
src/main/java/leetcode/editor/cn/FindGreatestCommonDivisorOfArray.java
View File

@ -45,31 +45,32 @@
// 👍 2 👎 0
package leetcode.editor.cn;
//1979:找出数组的最大公约数
class FindGreatestCommonDivisorOfArray{
class FindGreatestCommonDivisorOfArray {
public static void main(String[] args) {
//测试代码
Solution solution = new FindGreatestCommonDivisorOfArray().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public int findGCD(int[] nums) {
int max = Integer.MIN_VALUE;
int min = Integer.MAX_VALUE;
for (int num : nums) {
max = Math.max(max, num);
min = Math.min(min, num);
}
for (int i = min; i >= 1; i--) {
if (max % i == 0 && min % i == 0) {
return i;
class Solution {
public int findGCD(int[] nums) {
int max = Integer.MIN_VALUE;
int min = Integer.MAX_VALUE;
for (int num : nums) {
max = Math.max(max, num);
min = Math.min(min, num);
}
for (int i = min; i >= 1; i--) {
if (max % i == 0 && min % i == 0) {
return i;
}
}
return 1;
}
return 1;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

29
src/main/java/leetcode/editor/cn/FindRightInterval.java
View File

@ -54,29 +54,30 @@ import java.util.Map;
import java.util.TreeMap;
//436:寻找右区间
class FindRightInterval{
class FindRightInterval {
public static void main(String[] args) {
//测试代码
Solution solution = new FindRightInterval().new Solution();
TwoArray twoArray = new TwoArray("[[1,4],[2,3],[3,4]]",true);
TwoArray twoArray = new TwoArray("[[1,4],[2,3],[3,4]]", true);
solution.findRightInterval(twoArray.getArr());
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public int[] findRightInterval(int[][] intervals) {
TreeMap<Integer, Integer> map = new TreeMap<>();
for (int i = 0; i < intervals.length; i++) {
map.put(intervals[i][0], i);
class Solution {
public int[] findRightInterval(int[][] intervals) {
TreeMap<Integer, Integer> map = new TreeMap<>();
for (int i = 0; i < intervals.length; i++) {
map.put(intervals[i][0], i);
}
int[] result = new int[intervals.length];
for (int i = 0; i < intervals.length; i++) {
Integer key = map.higherKey(intervals[i][1] - 1);
result[i] = key == null ? -1 : map.get(key);
}
return result;
}
int[] result = new int[intervals.length];
for(int i = 0; i < intervals.length; i++){
Integer key = map.higherKey(intervals[i][1]-1);
result[i] = key == null?-1:map.get(key);
}
return result;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

30
src/main/java/leetcode/editor/cn/FindTheDifference.java
View File

@ -35,28 +35,28 @@
package leetcode.editor.cn;
//389:找不同
public class FindTheDifference{
public class FindTheDifference {
public static void main(String[] args) {
Solution solution = new FindTheDifference().new Solution();
}
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public char findTheDifference(String s, String t) {
int[] chs = new int[26];
for (char ch:s.toCharArray()){
chs[ch-'a']++;
}
for (char ch:t.toCharArray()){
if(chs[ch-'a']==0){
return ch;
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public char findTheDifference(String s, String t) {
int[] chs = new int[26];
for (char ch : s.toCharArray()) {
chs[ch - 'a']++;
}
chs[ch-'a']--;
for (char ch : t.toCharArray()) {
if (chs[ch - 'a'] == 0) {
return ch;
}
chs[ch - 'a']--;
}
return 'a';
}
return 'a';
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

35
src/main/java/leetcode/editor/cn/FindTheMostCompetitiveSubsequence.java
View File

@ -39,33 +39,34 @@ package leetcode.editor.cn;
import java.util.Stack;
//1673:找出最具竞争力的子序列
public class FindTheMostCompetitiveSubsequence{
public class FindTheMostCompetitiveSubsequence {
public static void main(String[] args) {
//测试代码
Solution solution = new FindTheMostCompetitiveSubsequence().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public int[] mostCompetitive(int[] nums, int k) {
int size = nums.length;
Stack<Integer> stack = new Stack<>();
for (int i = 0; i < size; i++) {
while (!stack.isEmpty()&&nums[i]< stack.peek()&&k-stack.size()<size-i){
stack.pop();
class Solution {
public int[] mostCompetitive(int[] nums, int k) {
int size = nums.length;
Stack<Integer> stack = new Stack<>();
for (int i = 0; i < size; i++) {
while (!stack.isEmpty() && nums[i] < stack.peek() && k - stack.size() < size - i) {
stack.pop();
}
if (stack.size() < k) {
stack.add(nums[i]);
}
}
if (stack.size() < k) {
stack.add(nums[i]);
int[] result = new int[k];
while (k > 0) {
result[k - 1] = stack.pop();
k--;
}
return result;
}
int[] result = new int[k];
while (k>0){
result[k-1]=stack.pop();
k--;
}
return result;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

30
src/main/java/leetcode/editor/cn/FindUniqueBinaryString.java
View File

@ -44,31 +44,31 @@ import java.util.Arrays;
import java.util.List;
//1980:找出不同的二进制字符串
class FindUniqueBinaryString{
class FindUniqueBinaryString {
public static void main(String[] args) {
//测试代码
Solution solution = new FindUniqueBinaryString().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public String findDifferentBinaryString(String[] nums) {
int n = nums.length;
List<String> list = Arrays.asList(nums);
int max = (int) Math.pow(2, n);
for (int i = max - 1; i >= 0; i--) {
if (!list.contains(Integer.toBinaryString(i))) {
String temp = Integer.toBinaryString(i);
while (temp.length() < n) {
temp = "0" + temp;
class Solution {
public String findDifferentBinaryString(String[] nums) {
int n = nums.length;
List<String> list = Arrays.asList(nums);
int max = (int) Math.pow(2, n);
for (int i = max - 1; i >= 0; i--) {
if (!list.contains(Integer.toBinaryString(i))) {
String temp = Integer.toBinaryString(i);
while (temp.length() < n) {
temp = "0" + temp;
}
return temp;
}
return temp;
}
return null;
}
return null;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

2
src/main/java/leetcode/editor/cn/FindValidMatrixGivenRowAndColumnSums.java
View File

@ -83,7 +83,7 @@ class FindValidMatrixGivenRowAndColumnSums {
int[][] arrs = new int[rowSum.length][colSum.length];
for (int i = 0; i < rowSum.length; i++) {
for (int j = 0; j < colSum.length; j++) {
arrs[i][j] = Math.min(rowSum[i],colSum[j]);
arrs[i][j] = Math.min(rowSum[i], colSum[j]);
rowSum[i] -= arrs[i][j];
colSum[j] -= arrs[i][j];
}

7
src/main/java/leetcode/editor/cn/FindingPairsWithACertainSum.java
View File

@ -65,14 +65,15 @@ import java.util.HashMap;
import java.util.Map;
//1865:找出和为指定值的下标对
public class FindingPairsWithACertainSum{
public class FindingPairsWithACertainSum {
public static void main(String[] args) {
//测试代码
// Solution solution = new FindingPairsWithACertainSum().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class FindSumPairs {
class FindSumPairs {
int[] nums1;
int[] nums2;
@ -99,7 +100,7 @@ class FindSumPairs {
}
return count;
}
}
}
/**
* Your FindSumPairs object will be instantiated and called as such:

53
src/main/java/leetcode/editor/cn/FindingTheUsersActiveMinutes.java
View File

@ -57,43 +57,44 @@ import java.util.List;
import java.util.Map;
//1817:查找用户活跃分钟数
public class FindingTheUsersActiveMinutes{
public class FindingTheUsersActiveMinutes {
public static void main(String[] args) {
//测试代码
Solution solution = new FindingTheUsersActiveMinutes().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public int[] findingUsersActiveMinutes(int[][] logs, int k) {
Map<Integer, List<Integer>> map = new HashMap<>();
int min = Integer.MAX_VALUE;
for (int i = 0; i < logs.length; i++) {
List<Integer> temp;
min = Math.min(min, logs[i][0]);
if (map.containsKey(logs[i][0])) {
temp = map.get(logs[i][0]);
if (!temp.contains(logs[i][1])) {
class Solution {
public int[] findingUsersActiveMinutes(int[][] logs, int k) {
Map<Integer, List<Integer>> map = new HashMap<>();
int min = Integer.MAX_VALUE;
for (int i = 0; i < logs.length; i++) {
List<Integer> temp;
min = Math.min(min, logs[i][0]);
if (map.containsKey(logs[i][0])) {
temp = map.get(logs[i][0]);
if (!temp.contains(logs[i][1])) {
temp.add(logs[i][1]);
}
map.put(logs[i][0], temp);
} else {
temp = new ArrayList<>();
temp.add(logs[i][1]);
map.put(logs[i][0], temp);
}
map.put(logs[i][0], temp);
} else {
temp = new ArrayList<>();
temp.add(logs[i][1]);
map.put(logs[i][0], temp);
}
int[] result = new int[k];
for (int i = 0; i < k; i++) {
result[i] = 0;
}
for (int key : map.keySet()) {
int index = map.get(key).size();
result[index - 1] = result[index - 1] + 1;
}
return result;
}
int[] result = new int[k];
for (int i = 0; i < k; i++) {
result[i] = 0;
}
for (int key : map.keySet()) {
int index = map.get(key).size();
result[index-1] = result[index-1] + 1;
}
return result;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

2
src/main/java/leetcode/editor/cn/FirstMissingPositive.java
View File

@ -45,7 +45,7 @@ public class FirstMissingPositive {
public static void main(String[] args) {
//测试代码
Solution solution = new FirstMissingPositive().new Solution();
solution.firstMissingPositive(new int[]{1,2,0});
solution.firstMissingPositive(new int[]{1, 2, 0});
}
//力扣代码

27
src/main/java/leetcode/editor/cn/FirstUniqueCharacterInAString.java
View File

@ -23,34 +23,35 @@ import java.util.HashMap;
import java.util.Map;
//387:字符串中的第一个唯一字符
class FirstUniqueCharacterInAString{
class FirstUniqueCharacterInAString {
public static void main(String[] args) {
//测试代码
Solution solution = new FirstUniqueCharacterInAString().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public int firstUniqChar(String s) {
class Solution {
public int firstUniqChar(String s) {
// for (int i = 0; i < s.length(); i++) {
// if(!s.substring(i+1).contains(""+s.charAt(i))&&!s.substring(0,i).contains(""+s.charAt(i))){
// return i;
// }
// }
// return -1;
Map<Character, Integer> map = new HashMap<>();
for (int i = 0; i < s.length(); ++i) {
char ch = s.charAt(i);
map.put(ch, map.getOrDefault(ch, 0) + 1);
}
for (int i = 0; i < s.length(); ++i) {
if (map.get(s.charAt(i)) == 1) {
return i;
Map<Character, Integer> map = new HashMap<>();
for (int i = 0; i < s.length(); ++i) {
char ch = s.charAt(i);
map.put(ch, map.getOrDefault(ch, 0) + 1);
}
for (int i = 0; i < s.length(); ++i) {
if (map.get(s.charAt(i)) == 1) {
return i;
}
}
return -1;
}
return -1;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

2
src/main/java/leetcode/editor/cn/FlattenNestedListIterator.java
View File

@ -81,7 +81,7 @@ public class FlattenNestedListIterator {
@Override
public boolean hasNext() {
return index< list.size();
return index < list.size();
}
}

4
src/main/java/leetcode/editor/cn/FlipGame.java
View File

@ -49,8 +49,8 @@ public class FlipGame {
public List<String> generatePossibleNextMoves(String currentState) {
List<String> list = new ArrayList<>();
for (int i = 1; i < currentState.length(); i++) {
if(currentState.charAt(i-1)=='+'&&currentState.charAt(i)=='+'){
list.add(currentState.substring(0,i-1)+"--"+currentState.substring(i+1));
if (currentState.charAt(i - 1) == '+' && currentState.charAt(i) == '+') {
list.add(currentState.substring(0, i - 1) + "--" + currentState.substring(i + 1));
}
}
return list;

10
src/main/java/leetcode/editor/cn/FourSum.java
View File

@ -66,11 +66,11 @@ class FourSum {
if (i > 0 && nums[i] == nums[i - 1]) {
continue;
}
sum = (long)nums[i] + nums[i + 1] + nums[i + 2] + nums[i + 3];
sum = (long) nums[i] + nums[i + 1] + nums[i + 2] + nums[i + 3];
if (sum > target) {
break;
}
sum = (long)nums[i] + nums[length - 3] + nums[length - 2] + nums[length - 1];
sum = (long) nums[i] + nums[length - 3] + nums[length - 2] + nums[length - 1];
if (sum < target) {
continue;
}
@ -78,18 +78,18 @@ class FourSum {
if (j > i + 1 && nums[j] == nums[j - 1]) {
continue;
}
sum = (long)nums[i] + nums[j] + nums[j + 1] + nums[j + 2];
sum = (long) nums[i] + nums[j] + nums[j + 1] + nums[j + 2];
if (sum > target) {
break;
}
sum = (long)nums[i] + nums[j] + nums[length - 2] + nums[length - 1];
sum = (long) nums[i] + nums[j] + nums[length - 2] + nums[length - 1];
if (sum < target) {
continue;
}
int start = j + 1;
int end = length - 1;
while (start < end) {
sum = (long)nums[i] + nums[j] + nums[start] + nums[end];
sum = (long) nums[i] + nums[j] + nums[start] + nums[end];
if (sum == target) {
result.add(Arrays.asList(nums[i], nums[j], nums[start], nums[end]));
while (start < end && nums[start] == nums[start + 1]) {

42
src/main/java/leetcode/editor/cn/FourXy4Wx.java
View File

@ -28,37 +28,39 @@
// 👍 25 👎 0
package leetcode.editor.cn;
//LCP 28:采购方案
public class FourXy4Wx{
public class FourXy4Wx {
public static void main(String[] args) {
//测试代码
Solution solution = new FourXy4Wx().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public int purchasePlans(int[] nums, int target) {
int[] sort = new int[target];
long[] count = new long[target];
for (int num : nums) {
if (num < target) {
sort[num] += 1;
class Solution {
public int purchasePlans(int[] nums, int target) {
int[] sort = new int[target];
long[] count = new long[target];
for (int num : nums) {
if (num < target) {
sort[num] += 1;
}
}
}
long sum = 0;
for (int i = 1; i < target; i++) {
sum += sort[i];
count[i] = sum;
}
long result = 0;
for (int num : nums) {
if (target > num) {
result += num <= target - num ? count[target - num] - 1 : count[target - num];
long sum = 0;
for (int i = 1; i < target; i++) {
sum += sort[i];
count[i] = sum;
}
long result = 0;
for (int num : nums) {
if (target > num) {
result += num <= target - num ? count[target - num] - 1 : count[target - num];
}
}
return (int) (result / 2 % (Math.pow(10, 9) + 7));
}
return (int) (result / 2 % (Math.pow(10, 9) + 7));
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

27
src/main/java/leetcode/editor/cn/FrequencyOfTheMostFrequentElement.java
View File

@ -49,28 +49,29 @@ package leetcode.editor.cn;
import java.util.Arrays;
//5739:最高频元素的频数
public class FrequencyOfTheMostFrequentElement{
public class FrequencyOfTheMostFrequentElement {
public static void main(String[] args) {
//测试代码
Solution solution = new FrequencyOfTheMostFrequentElement().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public int maxFrequency(int[] nums, int k) {
Arrays.sort(nums);
int ans = 1;
for(int i = 1, j = 0, sum = 0; i < nums.length; i += 1){
sum += (nums[i] - nums[i - 1]) * (i - j);
while(sum > k){
sum -= nums[i] - nums[j];
j += 1;
class Solution {
public int maxFrequency(int[] nums, int k) {
Arrays.sort(nums);
int ans = 1;
for (int i = 1, j = 0, sum = 0; i < nums.length; i += 1) {
sum += (nums[i] - nums[i - 1]) * (i - j);
while (sum > k) {
sum -= nums[i] - nums[j];
j += 1;
}
ans = Math.max(ans, i - j + 1);
}
ans = Math.max(ans, i - j + 1);
return ans;
}
return ans;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

2
src/main/java/leetcode/editor/cn/GenerateParentheses.java
View File

@ -44,7 +44,7 @@ class GenerateParentheses {
class Solution {
public List<String> generateParenthesis(int n) {
List<String> result = new ArrayList<>();
dfs(n,0,"",result);
dfs(n, 0, "", result);
return result;
}

55
src/main/java/leetcode/editor/cn/GetBiggestThreeRhombusSumsInAGrid.java
View File

@ -60,45 +60,46 @@ import java.util.*;
import java.util.stream.Collectors;
//1878:矩阵中最大的三个菱形和
public class GetBiggestThreeRhombusSumsInAGrid{
public class GetBiggestThreeRhombusSumsInAGrid {
public static void main(String[] args) {
//测试代码
Solution solution = new GetBiggestThreeRhombusSumsInAGrid().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public int[] getBiggestThree(int[][] grid) {
Set<Integer> set = new HashSet<>();
new TreeSet<>(Comparator.reverseOrder());
int xLength = grid.length;
int yLength = grid[0].length;
int size = (Math.min(xLength, yLength) + 1) / 2;
for (int i = 0; i < size; i++) {
for (int j = i; j < xLength - i; j++) {
for (int k = i; k < yLength - i; k++) {
int sum = 0;
for (int x = j - i; x <= j + i; x++) {
int cha = i - Math.abs(j - x);
if (Math.abs(j - x) == i) {
sum += grid[x][k + cha];
} else {
sum += grid[x][k - cha] + grid[x][k + cha];
class Solution {
public int[] getBiggestThree(int[][] grid) {
Set<Integer> set = new HashSet<>();
new TreeSet<>(Comparator.reverseOrder());
int xLength = grid.length;
int yLength = grid[0].length;
int size = (Math.min(xLength, yLength) + 1) / 2;
for (int i = 0; i < size; i++) {
for (int j = i; j < xLength - i; j++) {
for (int k = i; k < yLength - i; k++) {
int sum = 0;
for (int x = j - i; x <= j + i; x++) {
int cha = i - Math.abs(j - x);
if (Math.abs(j - x) == i) {
sum += grid[x][k + cha];
} else {
sum += grid[x][k - cha] + grid[x][k + cha];
}
}
set.add(sum);
}
set.add(sum);
}
}
List<Integer> list = set.stream().sorted(Comparator.reverseOrder()).collect(Collectors.toList());
int length = Math.min(list.size(), 3);
int[] result = new int[length];
for (int i = 0; i < length; i++) {
result[i] = list.get(i);
}
return result;
}
List<Integer> list = set.stream().sorted(Comparator.reverseOrder()).collect(Collectors.toList());
int length = Math.min(list.size(), 3);
int[] result = new int[length];
for (int i = 0; i < length; i++) {
result[i] = list.get(i);
}
return result;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

2
src/main/java/leetcode/editor/cn/GreatestCommonDivisorOfStrings.java
View File

@ -44,7 +44,7 @@ public class GreatestCommonDivisorOfStrings {
public static void main(String[] args) {
//测试代码
Solution solution = new GreatestCommonDivisorOfStrings().new Solution();
solution.gcdOfStrings("TAUXXTAUXXTAUXXTAUXXTAUXX","TAUXXTAUXXTAUXXTAUXXTAUXXTAUXXTAUXXTAUXXTAUXX");
solution.gcdOfStrings("TAUXXTAUXXTAUXXTAUXXTAUXX", "TAUXXTAUXXTAUXXTAUXXTAUXXTAUXXTAUXXTAUXXTAUXX");
}
//力扣代码

38
src/main/java/leetcode/editor/cn/GroupAnagrams.java
View File

@ -39,33 +39,33 @@ package leetcode.editor.cn;
import java.util.*;
//49:字母异位词分组
class GroupAnagrams{
class GroupAnagrams {
public static void main(String[] args) {
//测试代码
Solution solution = new GroupAnagrams().new Solution();
solution.groupAnagrams(new String[]{"eat","tea","tan","ate","nat","bat"});
solution.groupAnagrams(new String[]{"eat", "tea", "tan", "ate", "nat", "bat"});
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public List<List<String>> groupAnagrams(String[] strs) {
Map<String,List<String>> map = new HashMap<>();
for(String s:strs){
char[] chs = s.toCharArray();
Arrays.sort(chs);
String str = Arrays.toString(chs);
List<String> list = map.getOrDefault(str,new ArrayList<>());
list.add(s);
map.put(str,new ArrayList<>(list));
class Solution {
public List<List<String>> groupAnagrams(String[] strs) {
Map<String, List<String>> map = new HashMap<>();
for (String s : strs) {
char[] chs = s.toCharArray();
Arrays.sort(chs);
String str = Arrays.toString(chs);
List<String> list = map.getOrDefault(str, new ArrayList<>());
list.add(s);
map.put(str, new ArrayList<>(list));
}
List<List<String>> result = new ArrayList<>();
for (String key : map.keySet()) {
result.add(new ArrayList<>(map.get(key)));
}
return result;
}
List<List<String>> result = new ArrayList<>();
for (String key:map.keySet()){
result.add(new ArrayList<>(map.get(key)));
}
return result;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

33
src/main/java/leetcode/editor/cn/GroupAnagramsLcci.java
View File

@ -26,30 +26,31 @@ package leetcode.editor.cn;
import java.util.*;
//面试题 10.02:变位词组
class GroupAnagramsLcci{
class GroupAnagramsLcci {
public static void main(String[] args) {
//测试代码
Solution solution = new GroupAnagramsLcci().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public List<List<String>> groupAnagrams(String[] strs) {
Map<String,List<String>> map = new HashMap<>();
for (String str:strs){
char[] chars = str.toCharArray();
Arrays.sort(chars);
List<String> list = map.getOrDefault(new String(chars),new ArrayList<>());
list.add(str);
map.put(new String(chars),list);
class Solution {
public List<List<String>> groupAnagrams(String[] strs) {
Map<String, List<String>> map = new HashMap<>();
for (String str : strs) {
char[] chars = str.toCharArray();
Arrays.sort(chars);
List<String> list = map.getOrDefault(new String(chars), new ArrayList<>());
list.add(str);
map.put(new String(chars), list);
}
List<List<String>> result = new ArrayList<>();
for (String key : map.keySet()) {
result.add(map.get(key));
}
return result;
}
List<List<String>> result = new ArrayList<>();
for (String key: map.keySet()){
result.add(map.get(key));
}
return result;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

2
src/main/java/leetcode/editor/cn/HIndex.java
View File

@ -29,7 +29,7 @@ public class HIndex {
//测试代码
Solution solution = new HIndex().new Solution();
//3
System.out.println(solution.hIndex(new int[]{3,0,6,1,5}));
System.out.println(solution.hIndex(new int[]{3, 0, 6, 1, 5}));
//0
System.out.println(solution.hIndex(new int[]{0}));
}

5
src/main/java/leetcode/editor/cn/HouseRobberIi.java
View File

@ -64,12 +64,13 @@ public class HouseRobberIi {
}
return Math.max(range(Arrays.copyOfRange(nums, 0, length - 1)), range(Arrays.copyOfRange(nums, 1, length)));
}
public int range(int[] nums) {
int length = nums.length;
int start = nums[0],end = Math.max(nums[0],nums[1]);
int start = nums[0], end = Math.max(nums[0], nums[1]);
for (int i = 2; i < length; i++) {
int temp = end;
end = Math.max(start+nums[i],end);
end = Math.max(start + nums[i], end);
start = temp;
}
return end;

30
src/main/java/leetcode/editor/cn/HowManyNumbersAreSmallerThanTheCurrentNumber.java
View File

@ -47,27 +47,27 @@ import java.util.Collections;
import java.util.List;
//1365:有多少小于当前数字的数字
public class HowManyNumbersAreSmallerThanTheCurrentNumber{
public class HowManyNumbersAreSmallerThanTheCurrentNumber {
public static void main(String[] args) {
Solution solution = new HowManyNumbersAreSmallerThanTheCurrentNumber().new Solution();
}
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public int[] smallerNumbersThanCurrent(int[] nums) {
List<Integer> list = new ArrayList<>();
for (int i = 0; i < nums.length; i++) {
list.add(nums[i]);
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public int[] smallerNumbersThanCurrent(int[] nums) {
List<Integer> list = new ArrayList<>();
for (int i = 0; i < nums.length; i++) {
list.add(nums[i]);
}
Collections.sort(list);
int[] arrs = new int[nums.length];
for (int i = 0; i < nums.length; i++) {
arrs[i] = list.indexOf(nums[i]);
}
return arrs;
}
Collections.sort(list);
int[] arrs = new int[nums.length];
for (int i = 0; i < nums.length; i++) {
arrs[i] = list.indexOf(nums[i]);
}
return arrs;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

23
src/main/java/leetcode/editor/cn/HtmlEntityParser.java
View File

@ -67,24 +67,25 @@ package leetcode.editor.cn;
import java.util.Stack;
//1410:HTML 实体解析器
public class HtmlEntityParser{
public class HtmlEntityParser {
public static void main(String[] args) {
//测试代码
Solution solution = new HtmlEntityParser().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public String entityParser(String text) {
return text.
replace("&quot;", "\"").
replace("&apos;", "'").
replace("&gt;", ">").
replace("&lt;", "<").
replace("&frasl;", "/").
replace("&amp;", "&");
class Solution {
public String entityParser(String text) {
return text.
replace("&quot;", "\"").
replace("&apos;", "'").
replace("&gt;", ">").
replace("&lt;", "<").
replace("&frasl;", "/").
replace("&amp;", "&");
}
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

4
src/main/java/leetcode/editor/cn/ImplementQueueUsingStacks.java
View File

@ -91,11 +91,11 @@ public class ImplementQueueUsingStacks {
* Push element x to the back of queue.
*/
public void push(int x) {
while (!stack1.empty()){
while (!stack1.empty()) {
stack2.push(stack1.pop());
}
stack1.push(x);
while (!stack2.isEmpty()){
while (!stack2.isEmpty()) {
stack1.push(stack2.pop());
}
}

2
src/main/java/leetcode/editor/cn/ImplementTriePrefixTree.java
View File

@ -114,7 +114,7 @@ public class ImplementTriePrefixTree {
if (trie.son[index] == null) {
return false;
}
if (i == size-1 && !trie.son[index].isEnd) {
if (i == size - 1 && !trie.son[index].isEnd) {
return false;
}
trie = trie.son[index];

7
src/main/java/leetcode/editor/cn/IncreasingSubsequences.java
View File

@ -39,7 +39,7 @@ class IncreasingSubsequences {
public static void main(String[] args) {
//测试代码
Solution solution = new IncreasingSubsequences().new Solution();
System.out.println(solution.findSubsequences(new int[]{4,6,7,7}));
System.out.println(solution.findSubsequences(new int[]{4, 6, 7, 7}));
}
//力扣代码
@ -47,12 +47,13 @@ class IncreasingSubsequences {
class Solution {
private List<Integer> path = new ArrayList<>();
private List<List<Integer>> res = new ArrayList<>();
public List<List<Integer>> findSubsequences(int[] nums) {
backtracking(nums,0);
backtracking(nums, 0);
return res;
}
private void backtracking (int[] nums, int start) {
private void backtracking(int[] nums, int start) {
if (path.size() > 1) {
res.add(new ArrayList<>(path));
}

40
src/main/java/leetcode/editor/cn/IncrementalMemoryLeak.java
View File

@ -42,36 +42,38 @@
// 👍 2 👎 0
package leetcode.editor.cn;
//1860:增长的内存泄露
public class IncrementalMemoryLeak{
public class IncrementalMemoryLeak {
public static void main(String[] args) {
//测试代码
Solution solution = new IncrementalMemoryLeak().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public int[] memLeak(int memory1, int memory2) {
boolean isOne = memory1 >= memory2;
int i = 1;
while (true) {
if (isOne) {
if (memory1 < i) {
break;
class Solution {
public int[] memLeak(int memory1, int memory2) {
boolean isOne = memory1 >= memory2;
int i = 1;
while (true) {
if (isOne) {
if (memory1 < i) {
break;
}
memory1 -= i;
} else {
if (memory2 < i) {
break;
}
memory2 -= i;
}
memory1 -= i;
} else {
if (memory2 < i) {
break;
}
memory2 -= i;
i++;
isOne = memory1 >= memory2;
}
i++;
isOne = memory1 >= memory2;
return new int[]{i, memory1, memory2};
}
return new int[]{i,memory1,memory2};
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

79
src/main/java/leetcode/editor/cn/InsertionSortList.java
View File

@ -35,54 +35,55 @@ package leetcode.editor.cn;
import com.code.leet.entiy.ListNode;
//147:对链表进行插入排序
public class InsertionSortList{
public class InsertionSortList {
public static void main(String[] args) {
//测试代码
Solution solution = new InsertionSortList().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode() {}
* ListNode(int val) { this.val = val; }
* ListNode(int val, ListNode next) { this.val = val; this.next = next; }
* }
*/
class Solution {
public ListNode insertionSortList(ListNode head) {
if (head == null || head.next == null) {
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode() {}
* ListNode(int val) { this.val = val; }
* ListNode(int val, ListNode next) { this.val = val; this.next = next; }
* }
*/
class Solution {
public ListNode insertionSortList(ListNode head) {
if (head == null || head.next == null) {
return head;
}
ListNode current = head.next;
head.next = null;
while (current != null) {
ListNode temp = head;
ListNode next = current.next;
current.next = null;
if (current.val < temp.val) {
head = current;
head.next = temp;
} else {
while (temp.next != null) {
if (current.val < temp.next.val) {
current.next = temp.next;
temp.next = current;
break;
} else {
temp = temp.next;
}
}
temp.next = temp.next == null ? current : temp.next;
}
current = next;
}
return head;
}
ListNode current = head.next;
head.next = null;
while (current != null) {
ListNode temp = head;
ListNode next = current.next;
current.next = null;
if (current.val < temp.val) {
head = current;
head.next = temp;
} else {
while (temp.next != null) {
if (current.val < temp.next.val) {
current.next = temp.next;
temp.next = current;
break;
} else {
temp = temp.next;
}
}
temp.next = temp.next == null ? current : temp.next;
}
current = next;
}
return head;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

30
src/main/java/leetcode/editor/cn/IntegerToRoman.java
View File

@ -70,30 +70,32 @@
// 👍 593 👎 0
package leetcode.editor.cn;
//12:整数转罗马数字
public class IntegerToRoman{
public class IntegerToRoman {
public static void main(String[] args) {
//测试代码
Solution solution = new IntegerToRoman().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public String intToRoman(int num) {
int[] values = new int[]{1000,900,500,400,100,90,50,40,10,9,5,4,1};
String[] labels = new String[]{"M","CM","D","CD","C","XC","L","XL","X","IX","V","IV","I"};
StringBuilder sb = new StringBuilder();
for (int i = 0; i < values.length && num > 0; i++) {
int value = values[i];
String label = labels[i];
while (num >= value) {
sb.append(label);
num -= value;
class Solution {
public String intToRoman(int num) {
int[] values = new int[]{1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
String[] labels = new String[]{"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"};
StringBuilder sb = new StringBuilder();
for (int i = 0; i < values.length && num > 0; i++) {
int value = values[i];
String label = labels[i];
while (num >= value) {
sb.append(label);
num -= value;
}
}
return sb.toString();
}
return sb.toString();
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

39
src/main/java/leetcode/editor/cn/IntersectionOfTwoArraysIi.java
View File

@ -39,34 +39,35 @@ import java.util.Arrays;
import java.util.List;
//350:两个数组的交集 II
class IntersectionOfTwoArraysIi{
class IntersectionOfTwoArraysIi {
public static void main(String[] args) {
//测试代码
Solution solution = new IntersectionOfTwoArraysIi().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public int[] intersect(int[] nums1, int[] nums2) {
Arrays.sort(nums1);
Arrays.sort(nums2);
List<Integer> list = new ArrayList<>();
int index1 = 0;
int index2 = 0;
while(index1<nums1.length&&index2<nums2.length){
if(nums1[index1]==nums2[index2]){
list.add(nums1[index1]);
index1++;
index2++;
}else if (nums1[index1]>nums2[index2]){
index2++;
}else{
index1++;
class Solution {
public int[] intersect(int[] nums1, int[] nums2) {
Arrays.sort(nums1);
Arrays.sort(nums2);
List<Integer> list = new ArrayList<>();
int index1 = 0;
int index2 = 0;
while (index1 < nums1.length && index2 < nums2.length) {
if (nums1[index1] == nums2[index2]) {
list.add(nums1[index1]);
index1++;
index2++;
} else if (nums1[index1] > nums2[index2]) {
index2++;
} else {
index1++;
}
}
return list.stream().mapToInt(Integer::intValue).toArray();
}
return list.stream().mapToInt(Integer::intValue).toArray();
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

63
src/main/java/leetcode/editor/cn/IntersectionOfTwoLinkedLists.java
View File

@ -74,46 +74,47 @@ package leetcode.editor.cn;
import com.code.leet.entiy.ListNode;
//160:相交链表
public class IntersectionOfTwoLinkedLists{
public class IntersectionOfTwoLinkedLists {
public static void main(String[] args) {
//测试代码
Solution solution = new IntersectionOfTwoLinkedLists().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) {
* val = x;
* next = null;
* }
* }
*/
public class Solution {
public ListNode getIntersectionNode(ListNode headA, ListNode headB) {
ListNode pA = headA, pB = headB;
if(pA == null || pB == null){
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) {
* val = x;
* next = null;
* }
* }
*/
public class Solution {
public ListNode getIntersectionNode(ListNode headA, ListNode headB) {
ListNode pA = headA, pB = headB;
if (pA == null || pB == null) {
return null;
}
while (pA != null || pB != null) {
if (pA == null) {
pA = headB;
}
if (pB == null) {
pB = headA;
}
if (pA == pB) {
return pA;
}
pA = pA.next;
pB = pB.next;
}
return null;
}
while (pA != null || pB != null) {
if (pA == null) {
pA = headB;
}
if (pB == null) {
pB = headA;
}
if (pA == pB) {
return pA;
}
pA = pA.next;
pB = pB.next;
}
return null;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

63
src/main/java/leetcode/editor/cn/IntersectionOfTwoLinkedListsLcci.java
View File

@ -17,46 +17,47 @@ package leetcode.editor.cn;
import com.code.leet.entiy.ListNode;
//面试题 02.07:链表相交
public class IntersectionOfTwoLinkedListsLcci{
public class IntersectionOfTwoLinkedListsLcci {
public static void main(String[] args) {
//测试代码
Solution solution = new IntersectionOfTwoLinkedListsLcci().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) {
* val = x;
* next = null;
* }
* }
*/
public class Solution {
public ListNode getIntersectionNode(ListNode headA, ListNode headB) {
ListNode pA = headA, pB = headB;
if(pA == null || pB == null){
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) {
* val = x;
* next = null;
* }
* }
*/
public class Solution {
public ListNode getIntersectionNode(ListNode headA, ListNode headB) {
ListNode pA = headA, pB = headB;
if (pA == null || pB == null) {
return null;
}
while (pA != null || pB != null) {
if (pA == null) {
pA = headB;
}
if (pB == null) {
pB = headA;
}
if (pA == pB) {
return pA;
}
pA = pA.next;
pB = pB.next;
}
return null;
}
while (pA != null || pB != null) {
if (pA == null) {
pA = headB;
}
if (pB == null) {
pB = headA;
}
if (pA == pB) {
return pA;
}
pA = pA.next;
pB = pB.next;
}
return null;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

51
src/main/java/leetcode/editor/cn/InvertBinaryTree.java
View File

@ -30,39 +30,40 @@ package leetcode.editor.cn;
import com.code.leet.entiy.TreeNode;
//226:翻转二叉树
public class InvertBinaryTree{
public class InvertBinaryTree {
public static void main(String[] args) {
//测试代码
Solution solution = new InvertBinaryTree().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
/**
* Definition for a binary tree node.
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNode right;
* TreeNode() {}
* TreeNode(int val) { this.val = val; }
* TreeNode(int val, TreeNode left, TreeNode right) {
* this.val = val;
* this.left = left;
* this.right = right;
* }
* }
*/
class Solution {
public TreeNode invertTree(TreeNode root) {
if (root == null) {
return null;
/**
* Definition for a binary tree node.
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNode right;
* TreeNode() {}
* TreeNode(int val) { this.val = val; }
* TreeNode(int val, TreeNode left, TreeNode right) {
* this.val = val;
* this.left = left;
* this.right = right;
* }
* }
*/
class Solution {
public TreeNode invertTree(TreeNode root) {
if (root == null) {
return null;
}
TreeNode left = invertTree(root.left);
root.left = invertTree(root.right);
root.right = left;
return root;
}
TreeNode left = invertTree(root.left);
root.left = invertTree(root.right);
root.right = left;
return root;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

2
src/main/java/leetcode/editor/cn/IsGraphBipartite.java
View File

@ -60,7 +60,7 @@ public class IsGraphBipartite {
Solution solution = new IsGraphBipartite().new Solution();
// TwoArray twoArray = new TwoArray("[[1,3],[0,2],[1,3],[0,2]]");
System.out.println("-------------------------------");
TwoArray twoArray = new TwoArray("[[],[2,4,6],[1,4,8,9],[7,8],[1,2,8,9],[6,9],[1,5,7,8,9],[3,6,9],[2,3,4,6,9],[2,4,5,6,7,8]]",false);
TwoArray twoArray = new TwoArray("[[],[2,4,6],[1,4,8,9],[7,8],[1,2,8,9],[6,9],[1,5,7,8,9],[3,6,9],[2,3,4,6,9],[2,4,5,6,7,8]]", false);
System.out.println(solution.isBipartite(twoArray.getArr()));
}

31
src/main/java/leetcode/editor/cn/IsomorphicStrings.java
View File

@ -42,30 +42,31 @@ import java.util.HashMap;
import java.util.Map;
//205:同构字符串
public class IsomorphicStrings{
public class IsomorphicStrings {
public static void main(String[] args) {
//测试代码
Solution solution = new IsomorphicStrings().new Solution();
solution.isIsomorphic("badc","baba");
solution.isIsomorphic("badc", "baba");
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public boolean isIsomorphic(String s, String t) {
Map<Character,Character> sMap = new HashMap<>();
Map<Character,Character> tMap = new HashMap<>();
for (int i = 0; i < s.length(); i++) {
char sch = s.charAt(i);
char tch = t.charAt(i);
if((sMap.containsKey(sch)&&sMap.get(sch)!=tch)||(tMap.containsKey(tch)&&tMap.get(tch)!=sch)){
return false;
class Solution {
public boolean isIsomorphic(String s, String t) {
Map<Character, Character> sMap = new HashMap<>();
Map<Character, Character> tMap = new HashMap<>();
for (int i = 0; i < s.length(); i++) {
char sch = s.charAt(i);
char tch = t.charAt(i);
if ((sMap.containsKey(sch) && sMap.get(sch) != tch) || (tMap.containsKey(tch) && tMap.get(tch) != sch)) {
return false;
}
sMap.put(sch, tch);
tMap.put(tch, sch);
}
sMap.put(sch,tch);
tMap.put(tch,sch);
return true;
}
return true;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

2
src/main/java/leetcode/editor/cn/JEj789.java
View File

@ -59,7 +59,7 @@ public class JEj789 {
mins[i][1] = costs[i][1] + Math.min(mins[i - 1][0], mins[i - 1][2]);
mins[i][2] = costs[i][2] + Math.min(mins[i - 1][0], mins[i - 1][1]);
}
return Math.min(Math.min(mins[length-1][0],mins[length-1][1]),mins[length-1][2]);
return Math.min(Math.min(mins[length - 1][0], mins[length - 1][1]), mins[length - 1][2]);
}
}
//leetcode submit region end(Prohibit modification and deletion)

40
src/main/java/leetcode/editor/cn/JumpGameIi.java
View File

@ -36,37 +36,39 @@
// 👍 1053 👎 0
package leetcode.editor.cn;
//45:跳跃游戏 II
public class JumpGameIi{
public class JumpGameIi {
public static void main(String[] args) {
//测试代码
Solution solution = new JumpGameIi().new Solution();
System.out.println(solution.jump(new int[]{2,3,1,1,4}));
System.out.println(solution.jump(new int[]{2, 3, 1, 1, 4}));
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public int jump(int[] nums) {
if(nums.length==1){
return 0;
}
int max = 0;
int[] counts = new int[nums.length];
for (int i = 0; i < nums.length; i++) {
int next = i+nums[i];
if(next>=nums.length-1){
return counts[i]+1;
class Solution {
public int jump(int[] nums) {
if (nums.length == 1) {
return 0;
}
if(next>max){
for (int j = max+1; j <= next; j++) {
counts[j] = counts[i]+1;
int max = 0;
int[] counts = new int[nums.length];
for (int i = 0; i < nums.length; i++) {
int next = i + nums[i];
if (next >= nums.length - 1) {
return counts[i] + 1;
}
if (next > max) {
for (int j = max + 1; j <= next; j++) {
counts[j] = counts[i] + 1;
}
max = next;
}
max = next;
}
return counts[nums.length - 1];
}
return counts[nums.length-1];
}
}
//leetcode submit region end(Prohibit modification and deletion)
}

2
src/main/java/leetcode/editor/cn/JumpGameIv.java
View File

@ -66,7 +66,7 @@ public class JumpGameIv {
public static void main(String[] args) {
Solution solution = new JumpGameIv().new Solution();
// TO TEST
solution.minJumps(new int[]{100,-23,-23,404,100,23,23,23,3,404});
solution.minJumps(new int[]{100, -23, -23, 404, 100, 23, 23, 23, 3, 404});
}
//leetcode submit region begin(Prohibit modification and deletion)

Some files were not shown because too many files have changed in this diff Show More