03_MinStack.py

# Question link - https://leetcode.com/problems/min-stack/description/?envType=study-plan-v2&envId=top-interview-150

class MinStack:

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

    def push(self, val: int) -> None:
        self.stack.append(val)
        minVal = min(val , self.minStack[-1] if self.minStack else val)
        self.minStack.append(minVal)

    def pop(self) -> None:
        self.stack.pop()
        self.minStack.pop()

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

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


# Your MinStack object will be instantiated and called as such:
# obj = MinStack()
# obj.push(val)
# obj.pop()
# param_3 = obj.top()
# param_4 = obj.getMin()