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