백준 10866 - 덱 (Python3)

코드

n = int(input())
deq = []

for _ in range(n):
    cmd = input().split()
    
    if cmd[0] == 'push_front':
        deq.insert(0, cmd[1])
    elif cmd[0] == 'push_back':
        deq.append(cmd[1])
    elif cmd[0] == 'pop_front':
        if not deq:
            print(-1)
        else:
            print(deq.pop(0))
    elif cmd[0] == 'pop_back':
        if not deq:
            print(-1)
        else:
            print(deq.pop())
    elif cmd[0] == 'size':
        print(len(deq))
    elif cmd[0] == 'empty':
        if not deq:
            print(1)
        else:
            print(0)
    elif cmd[0] == 'front':
        if not deq:
            print(-1)
        else:
            print(deq[0])
    elif cmd[0] == 'back':
        if not deq:
            print(-1)
        else:
            print(deq[-1])