백준 (boj) 파이썬 - 10866 덱

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

10866번: 덱

 

 

 

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