Queue is a linear data structure that stores items in First In First Out (FIFO) manner. With a queue the least recently added item is removed first.
It is also possible to use a list as a queue, where the first element added is the first element retrieved (“first-in, first-out”); however, lists are not efficient for this purpose. While appends and pops from the end of list are fast, doing inserts or pops from the beginning of a list is slow (because all of the other elements have to be shifted by one).
Enqueue( ) - Using append ( ), adding the element in queue from rear end.
Dequeue ( )- Using pop(0) and popleft ( ) to remove the elements from front end in queue.
pop(0) takes O(n)
popleft( ) takes O(1).
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