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/*Design a stack that supports push, pop, top, and retrieving the minimum element in constant time.

push(x) -- Push element x onto stack.

pop() -- Removes the element on top of the stack.

top() -- Get the top element.

getMin() -- Retrieve the minimum element in the stack.

Example:

MinStack minStack = new MinStack();

minStack.push(-2);

minStack.push(0);

minStack.push(-3);

minStack.getMin(); --> Returns -3.

minStack.pop();

minStack.top(); --> Returns 0.

minStack.getMin(); --> Returns -2.*/

/**

* initialize your data structure here.

*/

var MinStack = function() {

this.stack = []

};

/**

* @param {number} x

* @return {void}

*/

MinStack.prototype.push = function(x) {

this.stack.unshift(x)

};

/**

* @return {void}

*/

MinStack.prototype.pop = function() {

this.stack.splice(0,1)

};

/**

* @return {number}

*/

MinStack.prototype.top = function() {

return this.stack[0]

};

/**

* @return {number}

*/

MinStack.prototype.getMin = function() {

var min = this.stack[0]

for(var i=0; i<this.stack.length; i++){

if(min > this.stack[i])

min = this.stack[i]

}

return min

};

/**

* Your MinStack object will be instantiated and called as such:

* var obj = Object.create(MinStack).createNew()

* obj.push(x)

* obj.pop()

* var param_3 = obj.top()

* var param_4 = obj.getMin()

*/