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

Collections.deque()

  • ss3225220
     + 0 comments
    from collections import deque

N = int(input())
d = deque()

for _ in range(N):
    commands = list(map(str,input().strip().split()))
    
    if commands[0] == 'append':
        d.append(int(commands[1]))
    elif commands[0] == 'appendleft':
        d.appendleft(int(commands[1]))
    elif commands[0] == 'extend':
        d.extend(int(commands[1]))
    elif commands[0] == 'extendleft':
        d.extendleft(int(commands[1]))
    elif commands[0] == 'pop':
        d.pop()
    elif commands[0] == 'popleft':
        d.popleft()
        

print(" ".join(map(str, list(d))))