func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long r;     cin >> r;     if (r % 2 == 0 || r == 1 || r == 3)       cout <<  NO ;     else {       long long x, y;       long long up = (r - 1);       for (int i = 1; i < 100000; i++) {         if ((up / i - i - 1) % 2 == 0) {           x = i;           y = (up / i - i - 1) / 2;           break;         }       }       cout << x <<     << y;     }     return 0;   }   