仔細找出要重複執行的條件，用 while 來處理 push/pop/enqueue/dequeue

常用指令

pop top

q = [1,2,3]
q.pop(0)
print(q) #[2,3]

remove first match

arr = [1,2,3,1]
arr.remove(1)
print(arr) #[2,3,1]

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