func_code_string: #include <bits/stdc++.h>   const int MAX_N = (int)1e5 + 123;   const double eps = 1e-6;   const int inf = (int)1e9 + 123;   using namespace std;   int n;   vector<int> ans[MAX_N];   int k;   int main() {     cin >> n;     ans[1].push_back(1), ans[2].push_back(1);     for (int i = 3, now = 2;; i++) {       if (n - now + 1 >= i - 1) {         k = i;         for (int j = 1; j < i; j++) {           ans[j].push_back(now);           ans[i].push_back(now);           now++;         }       } else         break;     }     cout << k << endl;     for (int i = 1; i <= k; i++) {       for (auto j : ans[i]) cout << j <<    ;       cout << endl;     }     return 0;   }   