Скачать или смотреть Reverse First K elements of Queue EASIEST ONE LINE PYTHON geeks for geeks contest python solution

Given an integer K and a queue of integers, we need to reverse the order of the first K elements of the queue, leaving the other elements in the same relative order.

Only following standard operations are allowed on queue.

enqueue(x) : Add an item x to rear of queue
dequeue() : Remove an item from front of queue
size() : Returns number of elements in queue.
front() : Finds front item.
Note: The above operations represent the general processings. In-built functions of the respective languages can be used to solve the problem.

Example 1:

Input:
5 3
1 2 3 4 5
Output:
3 2 1 4 5
Explanation:
After reversing the given
input from the 3rd position the resultant
output will be 3 2 1 4 5.
Example 2:

Input:
4 4
4 3 2 1
Output:
1 2 3 4
Explanation:
After reversing the given
input from the 4th position the resultant
output will be 1 2 3 4