[LeetCode]--225. Implement Stack using Queues

最新推荐文章于 2019-02-17 20:49:25 发布

杜鲁门

最新推荐文章于 2019-02-17 20:49:25 发布

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分类专栏： LeetCode LeetCode算法分析文章标签： leetcode 队列实现堆的算法堆算法队列算法

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本文介绍如何利用队列的基本操作（push to back, peek/pop from front, size, 和 is empty）来实现堆栈的功能，包括push、pop、top和empty。遵循题目要求，仅使用标准队列操作，并确保所有操作在合法情况下执行。" 54375441,5647824,蓝桥杯基础练习：字符串对比与算法解析,"['算法', '字符串处理', '数学问题', '编程竞赛', '矩阵运算']

Implement the following operations of a stack using queues.

push(x) – Push element x onto stack.
pop() – Removes the element on top of the stack.
top() – Get the top element.
empty() – Return whether the stack is empty.
Notes:
You must use only standard operations of a queue – which means only push to back, peek/pop from front, size, and is empty operations are valid.
Depending on your language, queue may not be supported natively. You may simulate a queue by using a list or deque (double-ended queue), as long as you use only standard operations of a queue.
You may assume that all operations are valid (for example, no pop or top operations will be called on an empty stack).
Update (2015-06-11):
The class name of the Java function had