func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, a, b, s = 1, d = 2, q[105][105];   int main() {     ios_base::sync_with_stdio(false);     cin >> n >> a >> b;     for (int i = 1; i <= a; ++i) {       for (int j = 1; j <= b; ++j) {         q[i][j] = 0;         if ((i + j) % 2 == 0) {           if (s <= n) {             q[i][j] = s;             s += 2;           }         }         if ((i + j) % 2 == 1) {           if (d <= n) {             q[i][j] = d;             d += 2;           }         }       }     }     if (s <= n || d <= n) {       cout <<  -1  << endl;       return 0;     }     for (int i = 1; i <= a; ++i) {       for (int j = 1; j <= b; ++j) {         cout << q[i][j] <<    ;       }       cout << endl;     }     return 0;   }   