Now, as you're familiar with operating on arrays, let's do an intricate task. Here, we'll do swapping of array elements.
Given an array A of N positive integers. The task is to swap every ith element of the array with (i+2)th element.
Note: When passing array to function, we basically pass the reference to the array. More details here. We'll learn more about pointers and references in the next module.
First line of input contains number of testcase T. For each testcase, there will be two lines, first of which contains size of array N and next line contains N space seperated positive integers.
For each testcase, print the modified array.
1 <= T <= 100
1 <= N <= 106
1 <= Ai <= 106
Your task is to complete the function swapElements(), which should swap each ith element with (i+2)th element. No need to print or return the array.
1 2 3 4 5
3 4 5 2 1
Explanation: Testcase 1: Swapping 1 and 3, makes the array 3 2 1 4 5. Now, swapping 2 and 4, makes the array 3 4 1 2 5. Again, swapping 1 and 5, makes the array 3 4 5 2 1.