LeetCode 155 - Min Stack - 2023.10.28 solution

StackItem = namedtuple("StackItem", "val minimum")
class MinStack:

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

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

    def pop(self) -> None:
        return self.stack.pop().val

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

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


# 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()