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