LeetCode Problem | DSA Qustion | Divisible and Non-divisible Sums Difference

Divisible and Non-divisible Sums Difference LeetCode Problem
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.
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