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  1. Prepare
  2. Python
  3. Collections
  4. Collections.deque()
  5. Discussions

Collections.deque()

  • kcmutya
     + 0 comments
    # Enter your code here. Read input from STDIN. Print output to STDOUT
from collections import deque

n = int(input())
empty_queue = deque()

for i in range(n):
    m = input().split()

    if m[0] == 'append':
        empty_queue.append(m[1])
    if m[0] == 'pop':
        empty_queue.pop()
    if m[0] == 'appendleft':
        empty_queue.appendleft(m[1])
    if m[0] == 'popleft':
        empty_queue.popleft()

print(*empty_queue)