Merge branch 'master' of https://gitee.com/huangge1199_admin/leet-code
Conflicts: src/main/java/leetcode/editor/cn/doc/all.json src/main/java/leetcode/editor/cn/doc/content/PathSumIii.md src/main/java/leetcode/editor/cn/doc/translation.json
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src/main/java/leetcode/editor/cn/DestinationCity.java
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src/main/java/leetcode/editor/cn/DestinationCity.java
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//给你一份旅游线路图,该线路图中的旅行线路用数组 paths 表示,其中 paths[i] = [cityAi, cityBi] 表示该线路将会从
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//cityAi 直接前往 cityBi 。请你找出这次旅行的终点站,即没有任何可以通往其他城市的线路的城市。
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//
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// 题目数据保证线路图会形成一条不存在循环的线路,因此恰有一个旅行终点站。
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//
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//
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//
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// 示例 1:
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//
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//
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//输入:paths = [["London","New York"],["New York","Lima"],["Lima","Sao Paulo"]]
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//输出:"Sao Paulo"
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//解释:从 "London" 出发,最后抵达终点站 "Sao Paulo" 。本次旅行的路线是 "London" -> "New York" ->
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//"Lima" -> "Sao Paulo" 。
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//
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//
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// 示例 2:
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//
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//
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//输入:paths = [["B","C"],["D","B"],["C","A"]]
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//输出:"A"
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//解释:所有可能的线路是:
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//"D" -> "B" -> "C" -> "A".
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//"B" -> "C" -> "A".
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//"C" -> "A".
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//"A".
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//显然,旅行终点站是 "A" 。
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//
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//
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// 示例 3:
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//
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//
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//输入:paths = [["A","Z"]]
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//输出:"Z"
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//
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//
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//
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//
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// 提示:
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//
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//
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// 1 <= paths.length <= 100
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// paths[i].length == 2
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// 1 <= cityAi.length, cityBi.length <= 10
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// cityAi != cityBi
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// 所有字符串均由大小写英文字母和空格字符组成。
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//
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// Related Topics 哈希表 字符串 👍 86 👎 0
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package leetcode.editor.cn;
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import java.util.ArrayList;
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import java.util.List;
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//1436:旅行终点站
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class DestinationCity {
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public static void main(String[] args) {
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//测试代码
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Solution solution = new DestinationCity().new Solution();
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}
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//力扣代码
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//leetcode submit region begin(Prohibit modification and deletion)
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class Solution {
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public String destCity(List<List<String>> paths) {
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List<String> result = new ArrayList<>();
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List<String> use = new ArrayList<>();
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for (List<String> path : paths) {
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if (!use.contains(path.get(1))) {
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result.add(path.get(1));
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}else {
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use.remove(path.get(1));
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}
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if (!result.contains(path.get(0))) {
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use.add(path.get(0));
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} else {
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result.remove(path.get(0));
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}
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}
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return result.get(0);
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}
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}
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//leetcode submit region end(Prohibit modification and deletion)
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}
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src/main/java/leetcode/editor/cn/PathSumIii.java
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src/main/java/leetcode/editor/cn/PathSumIii.java
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//给定一个二叉树的根节点 root ,和一个整数 targetSum ,求该二叉树里节点值之和等于 targetSum 的 路径 的数目。
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//
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// 路径 不需要从根节点开始,也不需要在叶子节点结束,但是路径方向必须是向下的(只能从父节点到子节点)。
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//
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//
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//
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// 示例 1:
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//
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//
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//
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//
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//输入:root = [10,5,-3,3,2,null,11,3,-2,null,1], targetSum = 8
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//输出:3
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//解释:和等于 8 的路径有 3 条,如图所示。
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//
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//
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// 示例 2:
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//
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//
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//输入:root = [5,4,8,11,null,13,4,7,2,null,null,5,1], targetSum = 22
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//输出:3
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//
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//
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//
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//
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// 提示:
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//
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//
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// 二叉树的节点个数的范围是 [0,1000]
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// -10⁹ <= Node.val <= 10⁹
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// -1000 <= targetSum <= 1000
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//
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// Related Topics 树 深度优先搜索 二叉树 👍 1091 👎 0
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package leetcode.editor.cn;
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import com.code.leet.entiy.TreeNode;
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//437:路径总和 III
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class PathSumIii {
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public static void main(String[] args) {
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//测试代码
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Solution solution = new PathSumIii().new Solution();
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}
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//力扣代码
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//leetcode submit region begin(Prohibit modification and deletion)
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/**
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* Definition for a binary tree node.
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* public class TreeNode {
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* int val;
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* TreeNode left;
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* TreeNode right;
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* TreeNode() {}
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* TreeNode(int val) { this.val = val; }
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* TreeNode(int val, TreeNode left, TreeNode right) {
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* this.val = val;
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* this.left = left;
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* this.right = right;
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* }
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* }
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*/
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class Solution {
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public int pathSum(TreeNode root, int targetSum) {
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if (root == null) {
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return 0;
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}
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int ret = rootSum(root, targetSum);
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ret += pathSum(root.left, targetSum);
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ret += pathSum(root.right, targetSum);
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return ret;
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}
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public int rootSum(TreeNode root, int targetSum) {
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int ret = 0;
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if (root == null) {
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return 0;
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}
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int val = root.val;
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if (val == targetSum) {
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ret++;
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}
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ret += rootSum(root.left, targetSum - val);
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ret += rootSum(root.right, targetSum - val);
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return ret;
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}
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}
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//leetcode submit region end(Prohibit modification and deletion)
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}
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<p>给你一份旅游线路图,该线路图中的旅行线路用数组 <code>paths</code> 表示,其中 <code>paths[i] = [cityA<sub>i</sub>, cityB<sub>i</sub>]</code> 表示该线路将会从 <code>cityA<sub>i</sub></code> 直接前往 <code>cityB<sub>i</sub></code> 。请你找出这次旅行的终点站,即没有任何可以通往其他城市的线路的城市<em>。</em></p>
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<p>题目数据保证线路图会形成一条不存在循环的线路,因此恰有一个旅行终点站。</p>
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<p> </p>
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<p><strong>示例 1:</strong></p>
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<pre>
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<strong>输入:</strong>paths = [["London","New York"],["New York","Lima"],["Lima","Sao Paulo"]]
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<strong>输出:</strong>"Sao Paulo"
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<strong>解释:</strong>从 "London" 出发,最后抵达终点站 "Sao Paulo" 。本次旅行的路线是 "London" -> "New York" -> "Lima" -> "Sao Paulo" 。
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</pre>
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<p><strong>示例 2:</strong></p>
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<pre>
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<strong>输入:</strong>paths = [["B","C"],["D","B"],["C","A"]]
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<strong>输出:</strong>"A"
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<strong>解释:</strong>所有可能的线路是:
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"D" -> "B" -> "C" -> "A".
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"B" -> "C" -> "A".
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"C" -> "A".
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"A".
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显然,旅行终点站是 "A" 。
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</pre>
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<p><strong>示例 3:</strong></p>
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<pre>
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<strong>输入:</strong>paths = [["A","Z"]]
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<strong>输出:</strong>"Z"
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</pre>
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<p> </p>
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<p><strong>提示:</strong></p>
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<ul>
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<li><code>1 <= paths.length <= 100</code></li>
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<li><code>paths[i].length == 2</code></li>
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<li><code>1 <= cityA<sub>i</sub>.length, cityB<sub>i</sub>.length <= 10</code></li>
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<li><code>cityA<sub>i </sub>!= cityB<sub>i</sub></code></li>
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<li>所有字符串均由大小写英文字母和空格字符组成。</li>
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</ul>
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<div><div>Related Topics</div><div><li>哈希表</li><li>字符串</li></div></div><br><div><li>👍 86</li><li>👎 0</li></div>
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