func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long t;     cin >> t;     while (t--) {       long long n, k;       cin >> n >> k;       n = n * k;       if (n % 2 == 1)         cout << n / 2 + 1;       else         cout << n / 2;       cout << endl;     }     return 0;   }   