[백준] 10866 덱 (파이썬 python)

 

 

문제 링크

 

 

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

10866번: 덱

 

 

문제

 

 

 

 

 

문제 풀이

 

 

import sys

input = sys.stdin.readline

deque = []

n = int(input())
for i in range(n):
    command = input().split()
    if command[0] == 'push_front':
        deque.insert(0, command[1])
    elif command[0] == 'push_back':
        deque.append(command[1])
    elif command[0] == 'pop_front':
        if len(deque) == 0:
            print(-1)
        else:
            print(deque.pop(0))
    elif command[0] == 'pop_back':
        if len(deque) == 0:
            print(-1)
        else:
            print(deque.pop())
    elif command[0] == 'size':
        print(len(deque))
    elif command[0] == 'empty':
        if len(deque) == 0:
            print(1)
        else:
            print(0)
    elif command[0] == 'front':
        if len(deque) == 0:
            print(-1)
        else:
            print(deque[0])
    elif command[0] == 'back':
        if len(deque) == 0:
            print(-1)
        else:
            print(deque[-1])