func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int t;     cin >> t;     while (t--) {       int n, k, ans = 0;       cin >> n >> k;       if (n % k > (k / 2)) {         cout << (n / k) * k + (k / 2) << endl;       } else {         cout << n << endl;       }     }   }   