Submission #880763

#	Time	Username	Problem	Language	Result	Execution time	Memory
880763		irmuun	Bosses (BOI16_bosses)	C++17	100 / 100	954 ms	1188 KiB

bosses

#include<bits/stdc++.h>

using namespace std;
 
#define ll long long
#define pb push_back
#define ff first
#define ss second
#define all(s) s.begin(),s.end()
#define rall(s) s.rbegin(),s.rend()

int main(){
    ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    ll n;
    cin>>n;
    vector<ll>adj[n+1];
    for(ll i=1;i<=n;i++){
        ll k;
        cin>>k;
        for(ll j=1;j<=k;j++){
            ll x;
            cin>>x;
            adj[x].pb(i);
        }
    }
    ll ans=1e18;
    vector<bool>used(n+1,0);
    ll tot[n+1];
    vector<ll>g[n+1];
    for(ll i=1;i<=n;i++){
        for(ll j=1;j<=n;j++){
            g[j].clear();
        }
        fill(all(used),0);
        queue<ll>q;
        q.push(i);
        used[i]=true;
        while(!q.empty()){
            ll x=q.front();
            q.pop();
            for(auto y:adj[x]){
                if(!used[y]){
                    used[y]=true;
                    g[x].pb(y);
                    q.push(y);
                }
            }
        }
        function <void(ll,ll)> dfs=[&](ll x,ll p){
            tot[x]=1;
            for(auto y:g[x]){
                if(y!=p){
                    dfs(y,x);
                    tot[x]+=tot[y];
                }
            }
        };
        dfs(i,0);
        ll cur=0;
        bool ok=true;
        for(ll i=1;i<=n;i++){
            cur+=tot[i];
            if(!used[i]){
                ok=false;
            }
        }
        if(ok) ans=min(ans,cur);
    }
    cout<<ans;
}

• Subtask 1: 22 / 22
• Subtask 2: 45 / 45
• Subtask 3: 33 / 33