func_code_string: #include <bits/stdc++.h>   using namespace std;   const int mod = 1000000007;   int main() {     int t;     cin >> t;     while (t--) {       int c, s, v = 0, m, d, k, y;       cin >> c >> s;       m = (s / 2);       d = (c / s);       k = (c % s);       if (m == 0) {         v = c;       } else {         if (k >= m) {           v = (c - k + m);         } else {           v = c;         }       }       cout << v << endl;     }     return 0;   }   