func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     int m = 1;     while (m * (m - 1) <= 2 * n) m++;     m = m - 1;     cout << m <<   n ;     int arr[m + 4][m + 3];     long long k = 1;     for (int i = 0; i < m; i++) {       long long count = 0;       for (int j = i; j < m - 1; j++) {         arr[i][j] = k + count++;       }       count = 0;       for (long long j = i + 1; j < m; j++) {         arr[j][i] = k + count++;       }       k = k + m - i - 1;     }     for (long long i = 0; i < m; i++) {       for (long long j = 0; j < m - 1; j++) {         cout << arr[i][j] <<    ;       }       cout <<   n ;     }   }   