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155.MinStack.js
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155.MinStack.js
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/**
* initialize your data structure here.
*/
var MinStack = function() {
this.st = [];
this.minst =[];
};
/**
* @param {number} x
* @return {void}
*/
MinStack.prototype.push = function(x) {
this.st.push(x);
if(this.minst.length!=0)
this.minst.push(Math.min(x,this.minst[this.minst.length-1]));
else this.minst.push(x);
};
/**
* @return {void}
*/
MinStack.prototype.pop = function() {
this.st.pop();
return this.minst.pop();
};
/**
* @return {number}
*/
MinStack.prototype.top = function() {
return this.st[this.st.length-1];
};
/**
* @return {number}
*/
MinStack.prototype.getMin = function() {
return this.minst[this.minst.length-1];
};
/**
* Your MinStack object will be instantiated and called as such:
* var obj = new MinStack()
* obj.push(x)
* obj.pop()
* var param_3 = obj.top()
* var param_4 = obj.getMin()
*/