diff --git a/src/main/java/leetcode/editor/cn/DesignAStackWithIncrementOperation.java b/src/main/java/leetcode/editor/cn/DesignAStackWithIncrementOperation.java new file mode 100644 index 0000000..5f141f2 --- /dev/null +++ b/src/main/java/leetcode/editor/cn/DesignAStackWithIncrementOperation.java @@ -0,0 +1,111 @@ +//请你设计一个支持下述操作的栈。 +// +// 实现自定义栈类 CustomStack : +// +// +// CustomStack(int maxSize):用 maxSize 初始化对象,maxSize 是栈中最多能容纳的元素数量,栈在增长到 maxSize +//之后则不支持 push 操作。 +// void push(int x):如果栈还未增长到 maxSize ,就将 x 添加到栈顶。 +// int pop():弹出栈顶元素,并返回栈顶的值,或栈为空时返回 -1 。 +// void inc(int k, int val):栈底的 k 个元素的值都增加 val 。如果栈中元素总数小于 k ,则栈中的所有元素都增加 val 。 +// +// +// +// +// +// 示例: +// +// 输入: +//["CustomStack","push","push","pop","push","push","push","increment","increment +//","pop","pop","pop","pop"] +//[[3],[1],[2],[],[2],[3],[4],[5,100],[2,100],[],[],[],[]] +//输出: +//[null,null,null,2,null,null,null,null,null,103,202,201,-1] +//解释: +//CustomStack customStack = new CustomStack(3); // 栈是空的 [] +//customStack.push(1); // 栈变为 [1] +//customStack.push(2); // 栈变为 [1, 2] +//customStack.pop(); // 返回 2 --> 返回栈顶值 2,栈变为 [1] +//customStack.push(2); // 栈变为 [1, 2] +//customStack.push(3); // 栈变为 [1, 2, 3] +//customStack.push(4); // 栈仍然是 [1, 2, 3],不能添加其他元素使栈大小变为 +// 4 +//customStack.increment(5, 100); // 栈变为 [101, 102, 103] +//customStack.increment(2, 100); // 栈变为 [201, 202, 103] +//customStack.pop(); // 返回 103 --> 返回栈顶值 103,栈变为 [201 +//, 202] +//customStack.pop(); // 返回 202 --> 返回栈顶值 202,栈变为 [201 +//] +//customStack.pop(); // 返回 201 --> 返回栈顶值 201,栈变为 [] +//customStack.pop(); // 返回 -1 --> 栈为空,返回 -1 +// +// +// +// +// 提示: +// +// +// 1 <= maxSize <= 1000 +// 1 <= x <= 1000 +// 1 <= k <= 1000 +// 0 <= val <= 100 +// 每种方法 increment,push 以及 pop 分别最多调用 1000 次 +// +// Related Topics 栈 设计 +// 👍 47 👎 0 + +package leetcode.editor.cn; + +//1381:设计一个支持增量操作的栈 +public class DesignAStackWithIncrementOperation { + public static void main(String[] args) { + //测试代码 +// Solution solution = new DesignAStackWithIncrementOperation().new Solution(); + } + + //力扣代码 + //leetcode submit region begin(Prohibit modification and deletion) + class CustomStack { + int[] stack; + int index; + + public CustomStack(int maxSize) { + stack = new int[maxSize]; + index = 0; + } + + public void push(int x) { + if (index < stack.length) { + stack[index] = x; + index++; + } + } + + public int pop() { + if(index==0){ + return -1; + } + index--; + int num = stack[index]; + stack[index] = 0; + return num; + } + + public void increment(int k, int val) { + int size = Math.min(index, k); + for (int i = 0; i < size; i++) { + stack[i] += val; + } + } + } + +/** + * Your CustomStack object will be instantiated and called as such: + * CustomStack obj = new CustomStack(maxSize); + * obj.push(x); + * int param_2 = obj.pop(); + * obj.increment(k,val); + */ +//leetcode submit region end(Prohibit modification and deletion) + +} \ No newline at end of file diff --git a/src/main/java/leetcode/editor/cn/DesignAStackWithIncrementOperation.md b/src/main/java/leetcode/editor/cn/DesignAStackWithIncrementOperation.md new file mode 100644 index 0000000..5a4e459 --- /dev/null +++ b/src/main/java/leetcode/editor/cn/DesignAStackWithIncrementOperation.md @@ -0,0 +1,48 @@ +
请你设计一个支持下述操作的栈。
+ +实现自定义栈类 CustomStack
:
CustomStack(int maxSize)
:用 maxSize
初始化对象,maxSize
是栈中最多能容纳的元素数量,栈在增长到 maxSize
之后则不支持 push
操作。void push(int x)
:如果栈还未增长到 maxSize
,就将 x
添加到栈顶。int pop()
:弹出栈顶元素,并返回栈顶的值,或栈为空时返回 -1 。void inc(int k, int val)
:栈底的 k
个元素的值都增加 val
。如果栈中元素总数小于 k
,则栈中的所有元素都增加 val
。+ +
示例:
+ +输入: +["CustomStack","push","push","pop","push","push","push","increment","increment","pop","pop","pop","pop"] +[[3],[1],[2],[],[2],[3],[4],[5,100],[2,100],[],[],[],[]] +输出: +[null,null,null,2,null,null,null,null,null,103,202,201,-1] +解释: +CustomStack customStack = new CustomStack(3); // 栈是空的 [] +customStack.push(1); // 栈变为 [1] +customStack.push(2); // 栈变为 [1, 2] +customStack.pop(); // 返回 2 --> 返回栈顶值 2,栈变为 [1] +customStack.push(2); // 栈变为 [1, 2] +customStack.push(3); // 栈变为 [1, 2, 3] +customStack.push(4); // 栈仍然是 [1, 2, 3],不能添加其他元素使栈大小变为 4 +customStack.increment(5, 100); // 栈变为 [101, 102, 103] +customStack.increment(2, 100); // 栈变为 [201, 202, 103] +customStack.pop(); // 返回 103 --> 返回栈顶值 103,栈变为 [201, 202] +customStack.pop(); // 返回 202 --> 返回栈顶值 202,栈变为 [201] +customStack.pop(); // 返回 201 --> 返回栈顶值 201,栈变为 [] +customStack.pop(); // 返回 -1 --> 栈为空,返回 -1 ++ +
+ +
提示:
+ +1 <= maxSize <= 1000
1 <= x <= 1000
1 <= k <= 1000
0 <= val <= 100
increment
,push
以及 pop
分别最多调用 1000
次