[백준/10866] 덱 (파이썬/python)

1️⃣ 문제

문제 링크 : https://www.acmicpc.net/problem/10866

2️⃣ 코드

import sys
from collections import deque

n=int(input())
deq = deque()

for i in range(n):
    str = list(sys.stdin.readline().split())
    if str[0]=='push_front':
        deq.appendleft(str[1])
    elif str[0]=='push_back':
        deq.append(str[1])
    elif str[0]=='pop_front':
        if deq:
            num = deq.popleft()
            print(num)
        else:
            print(-1)
    elif str[0]=='pop_back':
        if deq:
            num = deq.pop()
            print(num)
        else:
            print(-1)
    elif str[0]=='size':
        print(len(deq))
    elif str[0]=='empty':
        if len(deq):
            print(0)
        else:
            print(1)
    elif str[0]=='front':
        if deq:
            print(deq[0])
        else:
            print(-1)
    elif str[0]=='back':
        if deq:
            print(deq[-1])
        else:
            print(-1)