What are deque libraries and how do they work?

What are deque libraries and how do they work?

Deque libraries provide a double-ended queue data structure that allows insertion and deletion from both ends efficiently.

Can you give me an example of how to use a deque in Python?

Sure! You can use the collections.deque class in Python. Here's a simple example:

from collections import deque

my_deque = deque([1, 2, 3])
my_deque.append(4)  # Add to the right
my_deque.appendleft(0)  # Add to the left
print(my_deque)  # Output: deque([0, 1, 2, 3, 4])

What are the advantages of using a deque over a list?

Deques provide O(1) time complexity for append and pop operations from both ends, while lists have O(n) for these operations.

Are there any specific use cases where deques are preferred?

Yes, deques are ideal for implementing queues, stacks, and for scenarios where you need fast access to both ends of the data structure.