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

Collections.deque()

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  • samitdebnath435
     + 0 comments

    from collections import deque

    if name == 'main': N = int(input()) d = deque()

    for _ in range(N):

    command = input().split()
    operation = command[0]


    if operation == "append":
        d.append(int(command[1]))
    elif operation == "appendleft":
        d.appendleft(int(command[1]))
    elif operation == "pop":
        d.pop()
    elif operation == "popleft":
        d.popleft()


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

  • abhishekroy2512
     + 0 comments

    from collections import deque n = int(input()) d = deque() for _ in range(n): x =input().split() m = x[0] try: v= x[1] except Exception as e: pass

    match m:
    case "append":
        d.append(v)
    case "appendleft":
        d.appendleft(v)
    case "pop":
        d.pop()
    case "popleft":
        d.popleft()
    case _:
        print(-1)

    #

    print(*d)

  • rishabhkumar9167
     + 0 comments

    from collections import deque

    d=deque([]) n=int(input()) for _ in range(n): method,*args=input().split() if args: getattr(d,method)(*map(int,args)) else: getattr(d,method)() print(*d)

  • oleksii_zinchen1
     + 0 comments
    from collections import deque

lst = deque([])

for _ in range(int(input())):
    eval('lst.{0}({1})'.format(*input().split() + ['']))
    
print(*lst)``

  • malaikanoor7864
     + 0 comments
    from collections import deque
 
if __name__ == "__main__":
    n = int(input())
    d = deque()
    for i in range(n):
        temp =  input().split()
        if len(temp)>1:
            getattr(d,temp[0])(temp[1])
        else:
            getattr(d,temp[0])()
    print(' '.join(d))