제출 #951491

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
951491		Muhammad_Aneeq	Bosses (BOI16_bosses)	C++17	100 / 100	884 ms	1028 KiB

bosses

/*
بسم الله الرحمن الرحيم
Author:
                          (:Muhammad Aneeq:)
*/

#include <iostream>
#include <vector>
#include <queue>
using namespace std;
int const N=5e3+10;
vector<int>nei[N]={};
bool vis[N]={};
vector<int>gr[N]={};
int val[N]={};
long long cost=0;
void make_gr(int n)
{
    queue<int>Q;
    Q.push(n);
    while (Q.size())
    {
        int s=Q.front();
        Q.pop();
        for (auto i:gr[s])
            if (!vis[i])
            {
                vis[i]=1;
                nei[s].push_back(i);
                Q.push(i);
            }
    }
}   
void dfs(int n)
{
    int val1=0;
    for (auto i:nei[n])
    {
        dfs(i);
        val1+=val[i];
    }
    val[n]=val1+1;
    cost+=val[n];
}
inline void solve()
{
    int n;
    cin>>n;
    for (int i=1;i<=n;i++)
    {
        int k;
        cin>>k;
        while (k--)
        {
            int x;
            cin>>x;
            gr[x].push_back(i);
        }
    }
    long long ans=1e15+10;
    for (int i=1;i<=n;i++)
    {
        for (int j=1;j<=n;j++)
        {
            vis[j]=0,nei[j]={};
            val[i]=0;
        }
        vis[i]=1;
        make_gr(i);
        bool w=0;
        for (int i=1;i<=n;i++)
        {
            if (!vis[i])
                w=1;
        }
        if (w)
            continue;
        cost=0;
        dfs(i);
        ans=min(ans,cost);
    }
    cout<<ans<<endl;
}
int main()
{
    ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
        solve();
}

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