# -*- coding:utf-8 -*- class Solution: def __init__(self): self.stack1 = [] def push(self, node): self.stack1.append(node) def pop(self): return self.stack1.pop(0)
# -*- coding:utf-8 -*- class Solution: def __init__(self): self.stack1 = [] def push(self, node): self.stack1.append(node) def pop(self): return self.stack1.pop(0)