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Stack946.java
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62 lines (59 loc) · 1.76 KB
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package stack;
import java.util.Stack;
/**
* @ProjectName: leetcode
* @Package: stack
* @ClassName: Stack946
* @Author: markey
* @Description:
* 给定 pushed 和 popped 两个序列,只有当它们可能是在最初空栈上进行的推入 push 和弹出 pop 操作序列的结果时,返回 true;否则,返回 false 。
*
*
*
* 示例 1:
*
* 输入:pushed = [1,2,3,4,5], popped = [4,5,3,2,1]
* 输出:true
* 解释:我们可以按以下顺序执行:
* push(1), push(2), push(3), push(4), pop() -> 4,
* push(5), pop() -> 5, pop() -> 3, pop() -> 2, pop() -> 1
* 示例 2:
*
* 输入:pushed = [1,2,3,4,5], popped = [4,3,5,1,2]
* 输出:false
* 解释:1 不能在 2 之前弹出。
*
*
* 提示:
*
* 0 <= pushed.length == popped.length <= 1000
* 0 <= pushed[i], popped[i] < 1000
* pushed 是 popped 的排列。
*
* 来源:力扣(LeetCode)
* 链接:https://leetcode-cn.com/problems/validate-stack-sequences
* 著作权归领扣网络所有。商业转载请联系官方授权,非商业转载请注明出处。
* @Date: 2019/10/18 0:27
* @Version: 1.0
*/
public class Stack946 {
/**
* 执行用时 :6 ms, 在所有 java 提交中击败了75.00%的用户
* 内存消耗 :39.3 MB, 在所有 java 提交中击败了83.14%的用户
* @param pushed
* @param popped
* @return
*/
public boolean validateStackSequences(int[] pushed, int[] popped) {
Stack<Integer> stack = new Stack<>();
int j = 0;
for (int i = 0; i < pushed.length; i++) {
stack.push(pushed[i]);
while (!stack.isEmpty() && stack.peek() == popped[j]) {
stack.pop();
j++;
}
}
return j == popped.length;
}
}