2894_Divisible_and_Non_divisible_Sums_Difference.cpp

class Solution {
public:
    int differenceOfSums(int n, int m) {
        int s1 =0;
        int s2 = 0;
        for(int i = 0 ; i<=n ; ++i){
            if(i%m != 0){
                s1 += i;
                }
            else{
                s2 += i;
         }   
           
                }
        return s1 - s2;
    }
};