A queue is a FIFO (First-In, First-Out) collection: elements are added at the back and removed from the front, like a line of people.
Operations
text
enqueue(1) enqueue(2) enqueue(3) dequeue()->1
front ->[1][2][3]<- back front ->[2][3]<- back
Example
python
collections deque
queue = deque()
queue.append()
queue.append()
first = queue.popleft()
