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  1. #include <bits/stdc++.h> // ZENDA
  2. using namespace std;
  3. #define ll long long
  4. const ll lim=1e3+7;
  5. ll n,res=0,tmp=0;
  6. vector <ll> G[lim];
  7. vector <ll> GV[lim];
  8. bool par[lim],ok[lim];
  9. vector <ll> goc;
  10. void dfs(ll u){
  11.     ok[u]=1;
  12.     ll td=1;
  13.     if (tmp) return ;
  14.     for (ll v:G[u]){
  15.         if (tmp) return ;
  16.         if (!ok[v]){
  17.             td=0;
  18.             dfs(v);
  19.         }
  20.     }
  21.     if (td) tmp=1;
  22. }
  23. void dfsn(ll u){
  24.     ll td=0;
  25.     for (ll v:GV[u]){
  26.         if (tmp) return;
  27.         if (!ok[v]){
  28.             td=1;
  29.             dfsn(v);
  30.         }
  31.     }
  32.     if (tmp) return;
  33.     if (!td){
  34.         goc.push_back(u);
  35.         tmp=1;
  36.     }
  37. }
  38. int main(){
  39.     cin.tie(nullptr)->sync_with_stdio(0);
  40.     #define F "LONGCA"
  41.     if (ifstream(F".inp")){
  42.         freopen(F".inp","r",stdin);
  43.         freopen(F".out","w",stdout);
  44.     }
  45.     cin>>n;
  46.     for (ll i=1;i<=n;i++){
  47.         ll m;cin>>m;
  48.         for (ll j=1;j<=m;j++){
  49.             ll u;cin>>u;
  50.             G[i-1].push_back(u);
  51.             GV[u].push_back(i-1);
  52.             par[u]=1;
  53.         }
  54.     }
  55.     for (ll i=0;i<n;i++) if (!par[i]) goc.push_back(i);
  56.     res=goc.size();
  57.     for (ll u:goc){
  58.         tmp=0;
  59.         dfs(u);
  60.     }
  61.     ll td1=1;
  62.     while (td1){
  63.         td1=0;
  64.         goc.clear();
  65.         for (ll i=0;i<n;i++)
  66.             if (!ok[i]){
  67.                 tmp=0;
  68.                 dfsn(i);
  69.             }
  70.         if (goc.size()){
  71.             td1=1;
  72.             for (ll u:goc){
  73.                 if (!ok[u]){
  74.                     tmp=0;
  75.                     dfs(u);
  76.                     res++;
  77.                 }
  78.             }
  79.         }
  80.     }
  81.     cout<<res;
  82.     return 0;
  83. }
Success #stdin #stdout 0.01s 5328KB
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https://ideone.com/qEcQEF
language:
C++14 (gcc 8.3)
created:
4 days ago
visibility:
public

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