[백준] 18258번 큐 2 (파이썬)

18258번: 큐 2

 

코드

import sys
from collections import deque
n = int(sys.stdin.readline())
q = deque([])
for i in range(n):
    s = sys.stdin.readline().split()
    if s[0] == 'push':
        q.append(s[1])
    elif s[0] == 'pop':
        if not q:
            print(-1)
        else:
            print(q.popleft())
    elif s[0] == 'size':
        print(len(q))
    elif s[0] == 'empty':
        if not q:
            print(1)
        else:
            print(0)
    elif s[0] == 'front':
        if not q:
            print(-1)
        else:
            print(q[0])
    elif s[0] == 'back':
        if not q:
            print(-1)
        else:
            print(q[-1])