func_code_string: #include <bits/stdc++.h>   using namespace std;   int f3(int n) { return n * (n - 1) * (n - 2) / 6; }   int main() {     int K;     cin >> K;     int N = 3;     while (f3(N + 1) <= K) N++;     int MN = N * (N - 1) / 2;     int TN = 100;     vector<string> E(TN, string(TN,  0 ));     for (int i = 0; i < N; i++) {       for (int j = i + 1; j < N; j++) {         E[i][j] = E[j][i] =  1 ;       }     }     int GK = f3(N);     for (int i = N; i < TN; i++) {       for (int j = 0; j < N && GK + j <= K; j++) {         E[i][j] = E[j][i] =  1 ;         GK += j;       }     }     cout << TN << endl;     for (int i = 0; i < E.size(); i++) cout << E[i] << endl;   }   