力扣716. 最大栈
目录
力扣716. Max Stack（最大栈）
设计支持查找最大值的栈。会员题。
示例 1：
输入：["MaxStack","push","push","push","top","popMax","top","peekMax","pop","top"]
[[],[5],[1],[5],[],[],[],[],[],[]]
输出：[null,null,null,null,5,5,1,5,1,5]
解释：...提示：
- -10^7 <= x <= 10^7
- 最多调用 10^4 次操作