225. Implement Stack using Queues
var MyStack = function() {
this.stack = [];
};
/**
* @param {number} x
* @return {void}
*/
MyStack.prototype.push = function(x) {
this.stack.push(x);
};
/**
* @return {number}
*/
MyStack.prototype.pop = function() {
return this.stack.splice([this.stack.length - 1], 1)
};
/**
* @return {number}
*/
MyStack.prototype.top = function() {
return this.stack[this.stack.length - 1];
};
/**
* @return {boolean}
*/
MyStack.prototype.empty = function() {
return this.stack.length === 0;
};
/**
* Your MyStack object will be instantiated and called as such:
* var obj = new MyStack()
* obj.push(x)
* var param_2 = obj.pop()
* var param_3 = obj.top()
* var param_4 = obj.empty()
*/
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