Submission #503688

#	Time	Username	Problem	Language	Result	Execution time	Memory
503688		banterbry	Bosses (BOI16_bosses)	C++17	67 / 100	1529 ms	1096 KiB

bosses

// Factos 👍👀
#undef _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
#define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define int long long 
#define pb push_back
#define fi first
#define si second
#define ar array
typedef pair<int,int> pi;
typedef tuple<int,int,int> ti;  
void debug_out() { cerr << endl; }
template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {cerr << " " << to_string(H);debug_out(T...);}
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)

int N, ans = (1<<30);
vector<int> adj[5010], go[5010];
vector<int> vis, order, dp;
queue<int> q;

void dfs(int x) {
    for (auto i: go[x]) {
        dfs(i);
    }
    order.pb(x);
}

int32_t main() {
    fast;
    cin >> N;
    for (int i = 1; i <= N; ++i) {
        int k; cin >> k;
        for (int j = 0; j < k; ++j) {
            int x; cin >> x;
            adj[x].pb(i);
        }
    }
    for (int i = 1; i <= N; ++i) {
        for (int j = 1; j <= N; ++j) go[j].clear();
        vis.assign(N + 1, 0);
        order.clear();
        q.push(i);
        vis[i] = 1;
        while (q.size()) {
            int x = q.front(); q.pop();
            for (auto v: adj[x]) {
                if (vis[v]) continue;
                vis[v] = 1;
                go[x].pb(v);
                q.push(v);
            }
        }
        bool skip = false;
        for (int j = 1; j <= N; ++j) {
            if (!vis[j]) skip = true;
        }
        if (skip) continue;
        dfs(i); 
        dp.assign(N + 1, 0);
        for (auto i: order) {
            int sum = 0;
            for (auto j: go[i]) sum += dp[j];
            dp[i] = sum + 1;
        }
        int cur = 0;
        for (auto i: order) {
            cur += dp[i];
        }
        ans = min(ans, cur);
        // debug(cur);
    }
    cout << ans;
    return 0;
}

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