Method push

python/0155-min-stack.py:6–9

(self, val: int)

        self.minStack = []

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

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