제출 #951553

#제출 시각아이디문제언어결과실행 시간메모리
951553MuhammadSaramBosses (BOI16_bosses)C++17
0 / 100
1 ms604 KiB
#include <bits/stdc++.h> using namespace std; const int M = 5000; vector<int> nei[M],chi[M]; bool vis[M]; int subt[M],cst; void dfs(int u) { subt[u]=1; for (int i:chi[u]) { dfs(i); subt[u]+=subt[i]; } cst+=subt[u]; } void bfs(int v) { vis[v]=true; queue<int> q; q.push(v); while (!q.empty()) { int x=q.front(); q.pop(); for (int i:nei[x]) if (!vis[i]) { chi[x].push_back(i); q.push(i); vis[i]=true; } } dfs(v); } int main() { int n; cin>>n; for (int i=0;i<n;i++) { int k; cin>>k; for (int j=0;j<k;j++) { int x; cin>>x; x--; nei[x].push_back(i); } } int ans=n*(n+1)/2; for (int i=0;i<n;i++) { bfs(i); ans=min(ans,cst); cst=0; for (int j=0;j<n;j++) { vis[j]=false; chi[j].clear(); } } cout<<ans<<endl; return 0; }
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