Problem Description

Given an array of integers arr of even length n and an integer k.

We want to divide the array into exactly n / 2 pairs such that the sum of each pair is divisible by k.

Return true If you can find a way to do that or false otherwise.

Problem: https://leetcode.com/problems/check-i...
Code link: https://k5kc.com/cs/algorithms/sum-of...