func_code_string: #include <bits/stdc++.h>   using namespace std;   int x, y, a, b, num_of_results;   pair<int, int> game, results[10101];   int main() {     scanf( %d %d %d %d , &x, &y, &a, &b);     num_of_results = 0;     if (b >= x)       printf( 0 n );     else {       for (int i = a; i <= x; i++) {         for (int j = b; j <= y; j++) {           if (i > j) {             results[num_of_results++] = make_pair(i, j);           }         }       }       cout << num_of_results << endl;       for (int i = 0; i < num_of_results; i++) {         cout << results[i].first <<     << results[i].second << endl;       }     }   }   