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#include <bits/stdc++.h>
#define pb push_back
const int MAX = 1e6+7;
using namespace std;
 
vector<int> adj[MAX];
int vis[MAX];
int parent[MAX];
 
int find(int x){
    if(parent[x] != x) parent[x] = find(parent[x]);
    return parent[x];
}
 
void merge(int a, int b){
    parent[b] = a; 
}
 
void solve(void){
    int n, m;
    cin >> n >> m;
    for(int i= 1; i<= m; i++){
        parent[i] = i;
    }
 
    bool pretest_four = false;
    for(int i = 1 ; i <= n; i++){
        int k;
        cin >> k;
        if(k) pretest_four = true;
        int prev = -1;
        for(int i = 0; i < k; i++){
            int language;
            cin >> language;
            if(prev != -1){
                if(find(prev) == find(language)){
                    continue;
                }
                else{
                    merge(prev, language);
                }
            }
            prev = language;
        }
    }
 
    int cc = 0;
    for(int i = 1; i <= n; i++){
        if(parent[i] == i){
            cc++;
        }
    }
 
    if(!pretest_four){
        cout << n ;
        return;
    }
 
    cout << cc-1;
 
}
signed main() {
fio;
int t = 1;
// cin>>t;
    while(t--)
    solve();
 
    return 0;
}
 

Main.java:1: error: illegal character: '#'
#include <bits/stdc++.h>
^
Main.java:1: error: class, interface, or enum expected
#include <bits/stdc++.h>
         ^
Main.java:2: error: illegal character: '#'
#define pb push_back
^
Main.java:4: error: class, interface, or enum expected
using namespace std;
^
Main.java:6: error: class, interface, or enum expected
vector<int> adj[MAX];
^
Main.java:7: error: class, interface, or enum expected
int vis[MAX];
^
Main.java:8: error: class, interface, or enum expected
int parent[MAX];
^
Main.java:10: error: class, interface, or enum expected
int find(int x){
^
Main.java:12: error: class, interface, or enum expected
    return parent[x];
    ^
Main.java:13: error: class, interface, or enum expected
}
^
Main.java:17: error: class, interface, or enum expected
}
^
Main.java:21: error: class, interface, or enum expected
    cin >> n >> m;
    ^
Main.java:22: error: class, interface, or enum expected
    for(int i= 1; i<= m; i++){
    ^
Main.java:22: error: class, interface, or enum expected
    for(int i= 1; i<= m; i++){
                  ^
Main.java:22: error: class, interface, or enum expected
    for(int i= 1; i<= m; i++){
                         ^
Main.java:24: error: class, interface, or enum expected
    }
    ^
Main.java:27: error: class, interface, or enum expected
    for(int i = 1 ; i <= n; i++){
    ^
Main.java:27: error: class, interface, or enum expected
    for(int i = 1 ; i <= n; i++){
                    ^
Main.java:27: error: class, interface, or enum expected
    for(int i = 1 ; i <= n; i++){
                            ^
Main.java:29: error: class, interface, or enum expected
        cin >> k;
        ^
Main.java:30: error: class, interface, or enum expected
        if(k) pretest_four = true;
        ^
Main.java:31: error: class, interface, or enum expected
        int prev = -1;
        ^
Main.java:32: error: class, interface, or enum expected
        for(int i = 0; i < k; i++){
        ^
Main.java:32: error: class, interface, or enum expected
        for(int i = 0; i < k; i++){
                       ^
Main.java:32: error: class, interface, or enum expected
        for(int i = 0; i < k; i++){
                              ^
Main.java:34: error: class, interface, or enum expected
            cin >> language;
            ^
Main.java:35: error: class, interface, or enum expected
            if(prev != -1){
            ^
Main.java:38: error: class, interface, or enum expected
                }
                ^
Main.java:41: error: class, interface, or enum expected
                }
                ^
Main.java:44: error: class, interface, or enum expected
        }
        ^
Main.java:48: error: class, interface, or enum expected
    for(int i = 1; i <= n; i++){
    ^
Main.java:48: error: class, interface, or enum expected
    for(int i = 1; i <= n; i++){
                   ^
Main.java:48: error: class, interface, or enum expected
    for(int i = 1; i <= n; i++){
                           ^
Main.java:51: error: class, interface, or enum expected
        }
        ^
Main.java:56: error: class, interface, or enum expected
        return;
        ^
Main.java:57: error: class, interface, or enum expected
    }
    ^
Main.java:61: error: class, interface, or enum expected
}
^
Main.java:64: error: class, interface, or enum expected
int t = 1;
^
Main.java:66: error: class, interface, or enum expected
    while(t--)
    ^
Main.java:69: error: class, interface, or enum expected
    return 0;
    ^
Main.java:70: error: class, interface, or enum expected
}
^
41 errors

Standard output is empty