func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, k;   int main() {     cin >> n >> k;     int total = (n * (n - 1)) / 2;     if (total >= n * k) {       total = n * k;       cout << total <<   n ;       int nod1 = 1;       int nod2 = nod1 + 1;       int cate = 0;       while (total > 0) {         cate++;         if (nod2 > n) nod2 = 1;         cout << nod1 <<     << nod2 <<   n ;         if (cate == k) {           nod1++;           nod2 = nod1 + 1;           cate = 0;         } else           nod2++;         total--;       }     } else       cout << -1 <<   n ;   }   