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