Untitled

class MinStack(object):

    def __init__(self):
        self.stack = []
        self.minStack = []

    def push(self,val):
        self.stack.append(val)
        val = min(val, self.minStack[-1] if self.minStack else val)
        self.minStack.append(val)

    def pop(self):
        self.stack.pop()
        self.minStack.pop()

    def top(self):
        return max(self.stack)

    def getMin(self):
        return min(self.minStack)