Submission #571059

#	Time	Username	Problem	Language	Result	Execution time	Memory
571059		tamthegod	Bosses (BOI16_bosses)	C++14	100 / 100	1492 ms	980 KiB

bosses

#include<iostream>
#include<iomanip>
#include<algorithm>
#include<stack>
#include<queue>
#include<string>
#include<string.h>
#include<cmath>
#include<vector>
#include<map>
#include<unordered_map>
#include<set>
#include<unordered_set>
#include<cstdio>
#include<bitset>
#include<chrono>
#include<random>
#include<ext/rope>
/* ordered_set
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
*/
#define pb push_back
#define fi first
#define se second
using namespace std;
using ll = long long;
using ld = long double;
using ull = unsigned long long;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int maxN = 5000 + 5;
const int mod = 1e9 + 7;
const ll oo = 1e8;
int n;
vector<int> l[maxN];
vector<int> adj[maxN];
void ReadInput()
{
    cin >> n;
    for(int i=1; i<=n; i++)
    {
        int k;
        cin >> k;
        while(k--)
        {
            int p;
            cin >> p;
            l[p].pb(i);
        }
    }
}
int vis[maxN];
void build(int i)
{
    queue<int> q;
    q.push(i);
    vis[i] = -1;
    while(!q.empty())
    {
        int u = q.front();
        q.pop();
        for(int v : l[u])
        {
            if(vis[v]) continue;
            adj[u].pb(v);
            vis[v] = -1;
            q.push(v);
        }
    }
}
int f[maxN];
void dfs(int u)
{
    int s = 0;
    for(int v : adj[u])
    {
        dfs(v);
        s += f[v];
    }
    f[u] = s + 1;
}
int Cal(int i)
{
    for(int i=1; i<=n; i++) adj[i].clear();
    fill(vis, vis + n + 1, 0);
    fill(f, f + n + 1, 0);
    build(i);
    //for(int v : adj[1]) cout << v << " ";return 0;
    dfs(i);
    int res = 0;
    for(int i=1; i<=n; i++)
    {
        res += f[i];
        if(!f[i]) return oo;
    }
    return res;
}
void Solve()
{
    int res = oo;
    for(int i=1; i<=n; i++)
    {
        res = min(res, Cal(i));
    }
    cout << res;
}
int32_t main()
{
    //freopen("x.inp", "r", stdin);
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    ReadInput();
    Solve();
}

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