Swapping Pairs Make Sum Equal

In this class, We discuss Swapping Pairs Make Sum Equal.

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Question:

Given two arrays of size N and M.

Our task is to find a pair of elements from each array.

Swapping the elements makes the sum of elements in both arrays is same.

Example:

N = 6, M = 4

A = [4, 1, 2, 1, 1, 2]

B = [3, 6, 3, 3]

Output = 1

Swap elements one from A and three from B.

After swapping, the sum of elements is the same in both arrays.

There is a possibility to swap, so output 1.

If there is no such possibility, Then output -1.

Logic:

Two ways we can solve this example.

1) Using sorting

2) Using Heap

Both ways are important to understand.

The step-by-step explanation is provided in the video.

Code: