This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define f first
#define s second
#define mp make_pair
#define pb push_back
#define vll vector<ll>
#define fastio ios_base::sync_with_stdio(0),cin.tie(NULL),cout.tie(NULL)
using namespace std;
const ll N = 5005;
const ll MOD = 1e9+7;
vll adj[N];
vll adj2[N];
ll dp[N];
ll dis[N];
bool vis[N];
ll bfs(ll cur)
{
for(int i =0;i<N;i++)
{
dis[i]= -1;
vis[i]=false;
}
queue<ll> q;
q.push(cur);
vis[cur]=true;
dis[cur]=1;
while(!q.empty())
{
ll p = q.front();
q.pop();
for(auto v:adj[p])
{
if(vis[v]==false)
{
vis[v]=true;
dis[v]=dis[p]+1;
q.push(v);
}
}
}
ll co =0;
for(int i =1;i<N;i++)
{
if(vis[i]==false)continue;
co+=dis[i];
}
return co;
}
int main()
{
fastio;
ll n;
cin >> n;
bool poss=true;
ll src;
for(int i =1;i<=n;i++)
{
ll k;
cin >> k;
if(k==0)
{
src=i;
poss=false;
}
for(int j =1;j<=k;j++)
{
ll x;
cin >> x;
adj[x].pb(i);
}
}
if(!poss)
{
ll sum=bfs(src);
cout<<sum<<endl;
return 0;
}
ll ans = LLONG_MAX;
for(int i=1;i<=n;i++)
{
ll co=0;
ll sum=bfs(i);
for(int j =1;j<=n;j++)
{
if(vis[j])co++;
}
if(co==n)
//cout << i << " " << dp[i] << endl;
ans=min(ans,sum);
}
cout << ans << endl;
return 0;
}
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