CodeChef Starters 30 Division 4 (Rated) Swapping Chefs Way

Sure! Here is a response that provides explanations for each step of the problem "Swapping Chef's Way" from CodeChef Starters 30 Division 4 (Rated):

Step 1: Input

The first step is to take the input from the user. In this problem, the input consists of an integer N, followed by N integers A1, A2, ..., AN. The integer N represents the number of elements in the array, and the integers A1, A2, ..., AN represent the elements of the array.

Step 2: Calculate the sum

Next, we need to calculate the sum of all the elements in the array. We can do this by iterating over the array and adding each element to a variable called "sum".

Step 3: Check divisibility

After calculating the sum, we need to check if the sum is divisible by N. If the sum is not divisible by N, it means that we cannot achieve the desired target average by swapping elements. In this case, we output "Impossible" and terminate the program.

Step 4: Calculate the target average

If the sum is divisible by N, we proceed to calculate the target average. The target average is calculated by dividing the sum by N.

Step 5: Find elements to swap

Once we have the target average, we need to find two elements in the array that can be swapped to achieve the target average. To do this, we iterate over the array and check if the difference between the current element and the target average is present in the array. If we find such a pair, we output the indices of the two elements and terminate the program.

Step 6: Output "Impossible"

If we cannot find a pair of elements to swap, we output "Impossible" and terminate the program.

I hope this explanation helps! Let me know if you have any further questions.