Submission #349309

#	Time	Username	Problem	Language	Result	Execution time	Memory
349309		iANikzad	Bosses (BOI16_bosses)	C++14	100 / 100	781 ms	876 KiB

bosses

#include<bits/stdc++.h>

using namespace std;

#define pb push_back
#define F first
#define S second
#define debug(x) cerr<<#x<<" :"<<x<<"\n"
#define all(x) x.begin(),x.end()
#define pii pair<int,int>
#define FAST ios_base::sync_with_stdio(false), cin.tie(), cout.tie();
#define int long long

typedef long long ll;
typedef long double ld;

const int maxn = 5e3 + 7;
const int mod = 1e9 + 7;
const int INF = 1e9 + 7;
const int mlog = 20;
const int SQ = 400;

vector<int> adj[maxn];
int mark[maxn], dis[maxn];

int n;

int bfs(int root)
{
    queue<int> q;

    for(int i=1;i<=n;i++) mark[i] = dis[i] = 0;

    q.push(root);
    mark[root] = 1;
    dis[root] = 1;

    while(!q.empty())
    {
        int v = q.front();
        q.pop();

        for(int u : adj[v])
        {
            if(mark[u]) continue;

            mark[u] = true;
            dis[u] = dis[v] + 1;
            q.push(u);
        }
    }

    int res = 0;
    for(int i=1;i<=n;i++)
    {
        if(dis[i] == 0) return +INF;
        res += dis[i];
    }

    return res;
}

int32_t main()
{
    FAST;

    cin >> n;

    for(int i=1;i<=n;i++)
    {
        int k;
        cin >> k;

        for(int j=1;j<=k;j++)
        {
            int boss;
            cin >> boss;

            adj[boss].pb(i);
        }
    }

    int ans = +INF;
    for(int i=1;i<=n;i++)
    {
        int res = bfs(i);
        ans = min(ans, res);
    }

    cout << ans << "\n";

    return 0;
}

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