Submission #155940

#	Time	Username	Problem	Language	Result	Execution time	Memory
155940		aloo123	Bosses (BOI16_bosses)	C++14	0 / 100	2 ms	504 KiB

bosses

#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];
bool vis[N];
void dfs(ll cur,ll par)
{
    dp[cur]=0;
    vis[cur]=true;
    for(auto v:adj[cur])
    {
        if(v==par) continue;
        if(vis[v])continue;
        dfs(v,cur);
        dp[cur]+=dp[v];
        
    }
    dp[cur]+=1;
}

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)
    {
        dfs(src,-1);
        ll sum=0;
        for(int i =1;i<=n;i++) sum+=dp[i];
        cout<<sum<<endl;
    return 0;
    }
    ll ans = LLONG_MAX;
    for(int i=1;i<=n;i++)
    {
        
        
        
        for(int j =1;j<=n;j++) dp[j] =0,vis[j]=false;
        dfs(i,-1);
        ll co=0;
        for(int j =1;j<=n;j++)
        {
            if(vis[j])co++;
        }
        if(co==n) 
        {
            //cout << i << " " << dp[i] << endl;
            ll su=0;
            for(int j =1;j<=n;j++)su+=dp[j];
            ans=min(ans,su);
        }

    }   
    cout << ans << endl;

    
    return 0; 
}

• Subtask 1: 0 / 22
• Subtask 2: 0 / 45
• Subtask 3: 0 / 33