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