func_code_string: #include <bits/stdc++.h>   using namespace std;   vector<vector<int> > a;   bool g[100][100];   bool used[100];   int n;   void dfs(int v) {     used[v] = true;     for (int i = 0; i < n; i++)       if (g[v][i] && !used[i]) dfs(i);   }   int main() {     int m;     cin >> n >> m;     bool now = false;     for (int i = 0; i < n; i++)       for (int j = 0; j < n; j++) g[i][j] = false;     for (int i = 0; i < n; i++) used[i] = false;     a.resize(n);     for (int i = 0; i < n; i++) {       int num;       cin >> num;       if (num != 0) now = true;       a[i].resize(num);       for (int j = 0; j < num; j++) {         cin >> a[i][j];         a[i][j]--;       }     }     for (int i = 0; i < n; i++)       for (int j = i + 1; j < n; j++)         for (int i1 = 0; i1 < a[i].size(); i1++)           for (int j1 = 0; j1 < a[j].size(); j1++)             if (a[i][i1] == a[j][j1]) {               g[i][j] = true;               g[j][i] = true;             }     int result = 0;     for (int i = 0; i < n; i++)       if (!used[i]) {         dfs(i);         result++;       }     if (!now) result++;     cout << result - 1;   }   