题解 | #【模板】栈#
【模板】栈
https://www.nowcoder.com/practice/104ce248c2f04cfb986b92d0548cccbf
#我的代码比较简单，python3
n=int(input())
caozuo=[]
for i in range(n):
caozuo.append(input().split(' '))
x=[]
for i in caozuo:
if i[0]=='push':
x.append(int(i[1]))
if i[0]=='pop':
if len(x)>=1:
print(x[len(x)-1])
del(x[len(x)-1])
else:
print('error')
elif i[0]=='top':
if len(x)>=1:
print(x[len(x)-1])
else:
print('error')
