func_code_string: #include <bits/stdc++.h>   using namespace std;   int main()   {       long long tests, a, b, c, i,sum;       cin >> tests;       while (tests--)       {           cin >> a >> b >> c;           if (c / b + 1 >= a)               printf( %lld n ,(a*a-a)/2);           else               printf( %lld n ,(c/b)*(c/b+1)/2+(a-c/b-1)*(c/b));       }   }