func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, m;     cin >> n >> m;     if (n == 1 && m == 2) {       cout << 0 << endl;       cout << 1 <<     << 1 << endl;       cout << 1 <<     << 2 << endl;       cout << 1 <<     << 1 << endl;       return 0;     }     if (n == 2 && m == 1) {       cout << 0 << endl;       cout << 1 <<     << 1 << endl;       cout << 2 <<     << 1 << endl;       cout << 1 <<     << 1 << endl;       return 0;     }     if ((n % 2 && m % 2) || n == 1 || m == 1) {       cout << 1 << endl;       if (n == 1) {         cout << 1 <<     << m;         cout <<     << 1 <<     << 1 << endl;       } else if (m == 1) {         cout << 1 <<     << 1 <<     << n <<     << 1 << endl;       } else if (n % 2 == 1 && m % 2 == 1) {         cout << n <<     << m <<    ;         cout << n <<     << 1 << endl;       } else {         cout << n <<     << 1;         cout <<     << 1 <<     << 1 << endl;       }     } else       cout << 0 << endl;     if (m % 2 == 0) {       for (int i = 1; i <= m; i++) cout << 1 <<     << i << endl;       for (int j = m; j >= 1; j -= 2) {         for (int i = 2; i <= n; i++) cout << i <<     << j << endl;         for (int i = n; i > 1; i--) cout << i <<     << j - 1 << endl;       }       cout << 1 <<     << 1 << endl;     } else {       cout << 1 <<     << 1 << endl;       for (int i = 1; i <= n; i += 2) {         for (int j = 2; j <= m; j++) cout << i <<     << j << endl;         if (i != n)           for (int j = m; j >= 2; j--) cout << i + 1 <<     << j << endl;       }       if (n % 2 == 1 && m % 2 == 0) {         for (int i = 2; i <= n; i++) cout << i <<     << 1 << endl;         cout << 1 <<     << 1 << endl;       } else         for (int i = n; i >= 1; i--) cout << i <<     << 1 << endl;     }     return 0;   }   