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面-03-04-化栈为队.js
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面-03-04-化栈为队.js
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/**
* Initialize your data structure here.
*/
var MyQueue = function() {
this.pushStack = [];
this.popStack = [];
};
/**
* Push element x to the back of queue.
* @param {number} x
* @return {void}
*/
MyQueue.prototype.push = function(x) {
while(this.popStack.length > 0) {
this.pushStack.push(this.popStack.pop())
}
this.pushStack.push(x)
};
/**
* Removes the element from in front of queue and returns that element.
* @return {number}
*/
MyQueue.prototype.pop = function() {
while(this.pushStack.length > 0) {
this.popStack.push(this.pushStack.pop())
}
return this.popStack.pop()
};
/**
* Get the front element.
* @return {number}
*/
MyQueue.prototype.peek = function() {
while(this.pushStack.length > 0) {
this.popStack.push(this.pushStack.pop())
}
return this.popStack[this.popStack.length - 1]
};
/**
* Returns whether the queue is empty.
* @return {boolean}
*/
MyQueue.prototype.empty = function() {
return this.pushStack.length == this.popStack.length
};
/**
* Your MyQueue object will be instantiated and called as such:
* var obj = new MyQueue()
* obj.push(x)
* var param_2 = obj.pop()
* var param_3 = obj.peek()
* var param_4 = obj.empty()
*/