题解 | #【模板】队列#
【模板】队列
https://www.nowcoder.com/practice/afe812c80ad946f4b292a26dd13ba549
import sys
n = int(input())
l = []
for i in range(n):
a = input().split()
if a[0] == "push":
l.insert(0,a[1])
elif a[0] == "pop" and len(l) != 0:
print(l.pop())
elif a[0] == "front" and len(l) != 0:
print(l[-1])
else:
print("error")
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