PYTHON

min stack in python

class MinStack:

    def __init__(self):
        self.stack=deque([])
        self.min=deque([])

    def push(self, val: int) -> None:
        self.stack.append(val)
        if len(self.min)==0 or val<self.min[-1]:
            self.min.append(val)
        else:
            self.min.append(self.min[-1])

    def pop(self) -> None:
        x=self.stack.pop()
        self.min.pop()
        return x

    def top(self) -> int:
        return self.stack[-1]

    def getMin(self) -> int:
        return self.min[-1]