Divisible and Non-divisible Sums Difference

You are given positive integers n and m.

Define two integers, num1 and num2, as follows:

• num1: The sum of all integers in the range [1, n] that are not divisible by m.

• num2: The sum of all integers in the range [1, n] that are divisible by m.

Return the integer num1 - num2.

LeetCode Problem - 2894

class Solution {
    public int differenceOfSums(int n, int m) {
        // Variables to store the sum of numbers not divisible by m (num1) and the sum of numbers divisible by m (num2)
        int num1 = 0, num2 = 0;

        // Iterate through numbers from 1 to n
        for (int i = 1; i <= n; i++) {
            // If the current number is not divisible by m, add it to num1
            if (i % m != 0)
                num1 += i;
            // If the current number is divisible by m, add it to num2
            else
                num2 += i;
        }
        // Return the difference between num1 and num2
        return num1 - num2;
    }
}