Summary:

Suppose we have an array of n positive integers. Our task is to swap every ith element of the array with (i+2)th element.

Solution:

Explanation:

This code is a C++ function template that defines a class Solution with a member function swapElements. This function swaps every alternate element of the array with the element two positions ahead of it. Here's a breakdown of the code:

• class Solution{ ... };: This defines a class named Solution which encapsulates the solution for a problem.

• public:: This keyword declares that the members following it will be accessible from outside the class.

• void swapElements(int arr[], int n): This is a member function of the Solution class. It takes an integer array arr and its size n as input parameters.

• for(int i=0; i<n-2; i++): This loop iterates over the array from index 0 to n-3 (since n-2 is used as the loop condition).

• swap(arr[i], arr[i+2]): This function swaps the element at index i with the element at index i+2. It uses the swap function, which is a part of the C++ standard library and is used to swap two values.

So, in summary, this function swaps every alternate element of the array with the element two positions ahead of it, excluding the last two elements of the array.

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