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implement-stack-using-queues.js
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/**
* Source: https://leetcode.com/problems/implement-stack-using-queues/
* Tags: [Stack,Design]
* Level: Easy
* Title: Implement Stack using Queues
* Auther: @imcoddy
* Content: 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 been updated to MyStack instead of Stack.
*
*
* Credits:Special thanks to @jianchao.li.fighter for adding this problem and all test cases.
*
*
* Subscribe to see which companies asked this question
*
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* Show Similar Problems
*
*
* (E) Implement Queue using Stacks
*/
/**
* @constructor
*/
var Stack = function() {
};
/**
* @param {number} x
* @returns {void}
*/
Stack.prototype.push = function(x) {
};
/**
* @returns {void}
*/
Stack.prototype.pop = function() {
};
/**
* @returns {number}
*/
Stack.prototype.top = function() {
};
/**
* @returns {boolean}
*/
Stack.prototype.empty = function() {
};