Toph-Boltu vs Balti

#include<bits/stdc++.h>
using namespace std;
int main()
{
    long long int a,b,c,sum;
    while(cin>>a>>b){
            if(a>b)
            {
                c=a;
                a=b;
                b=c;
            }

    sum= (((b*(b+1))/2)-((a*(a+1))/2))+a;
    printf("Sum of %lld to %lld is -> %lld;\n",a,b,sum);}

    return 0;


}
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