100103. Divisible and Non-divisible Sums Difference.cpp

class Solution {
public:
    int differenceOfSums(int n, int m) {
        int count=0;
        int sum1=0,sum2=0;
        for(int i=1;i<=n;i++){
            if(i%m==0) sum1+=i;
            else sum2+=i;
        }
        return sum2-sum1;
    }
};