题解 | #【模板】栈#
【模板】栈
https://www.nowcoder.com/practice/104ce248c2f04cfb986b92d0548cccbf
import sys
n = int(input())
acts = []
stack = []
for i in range(n):
acts.append(input().split())
for act in acts:
if act[0]=='push':
stack.append(int(act[1]))
elif act[0]=='pop':
if len(stack)!=0:
print(stack.pop())
else:
print('error')
elif act[0]=='top':
if len(stack)!=0:
print(stack[-1])
else:
print('error')
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