Submission #78539

#	Time	Username	Problem	Language	Result	Execution time	Memory
78539		vex	Bosses (BOI16_bosses)	C++14	0 / 100	2 ms	640 KiB

bosses

#include <bits/stdc++.h>
#define maxn 5005
using namespace std;

int n;
vector<int>d[maxn],adj[maxn];
bool bio[maxn];

queue<pair<int,int>>mq;
void bfs(int v)
{
    mq.push({v,-1});
    while(!mq.empty())
    {
        int u=mq.front().first;
        int w=mq.front().second;
        mq.pop();

        if(bio[u])continue;
        bio[u]=true;
        if(w!=-1)adj[w].push_back(u);

        for(auto x:d[u])
        {
            if(bio[x])continue;
            mq.push({x,u});
        }
    }
}

int tre;
int dp[maxn];
void dfs(int v)
{
    dp[v]=1;
    for(auto x:adj[v])
    {
        dfs(x);
        dp[v]+=dp[x];
    }

    //cout<<dp[v]<<" ";
    tre+=dp[v];
}


int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);

    cin>>n;
    for(int i=1;i<=n;i++)
    {
        int x;
        cin>>x;
        for(int j=0;j<x;j++)
        {
            int w;
            cin>>w;
            d[w].push_back(i);
        }
    }

    /*for(int i=1;i<=n;i++)
    {
        cout<<i<<"     "<<d[i].size()<<"  ";
        for(auto x:d[i])cout<<x<<" ";
        cout<<endl;
    }
    cout<<endl<<endl;*/

    int sol=5*maxn*maxn;
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=n;j++)
        {
            bio[j]=false;
            adj[j].clear();
            dp[j]=0;
        }
        tre=0;

        bfs(i);
        /*for(int j=1;j<=n;j++)
        {
            cout<<j<<"     "<<adj[j].size()<<"  ";
            for(auto x:adj[j])cout<<x<<" ";
            cout<<endl;
        }*/

        dfs(i);
        //cout<<endl;for(int j=1;j<=n;j++)cout<<dp[j]<<" ";
        sol=min(tre,sol);
        /*cout<<tre<<endl;
        cout<<endl<<endl;*/
    }
    cout<<sol<<endl;
    return 0;
}

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