Submission #1201822

#	Time	Username	Problem	Language	Result	Execution time	Memory
1201822		waigoon	Bosses (BOI16_bosses)	C++20	67 / 100	1595 ms	1204 KiB

bosses

#include <bits/stdc++.h>
#define int long long
#define float long double
#define pii pair<int, int>
#define tii tuple<int, int, int>
#define f first
#define s second
#define ve vector
#define emb emplace_back
#define em emplace
 
using namespace std;
 
const int inf = 1e18;
const int mod = 1e9 + 7;

int32_t main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    int n;
    cin >> n;
    ve<ve<int>> inv(n);
    for (int i = 0; i < n; i++) {
        int k;
        cin >> k;
        while (k--) {
            int x;
            cin >> x;
            inv[x-1].emb(i);
        }
    }
    function<int(int, int, ve<ve<int>>&, ve<int>&)> dfs = [&](int x, int par, ve<ve<int>>& adj, ve<int>& val) {
        int sum = 0;
        for (auto e : adj[x]) if (e != par) sum += dfs(e, x, adj, val);
        return val[x] = sum + 1;
    };
    int mn = inf;
    for (int i = 0; i < n; i++) {
        queue<pii> q;
        ve<bool> vis(n, false);
        ve<ve<int>> adj(n);
        q.em(i, -1), vis[i] = true;
        int cnt = 1;
        while (!q.empty()) {
            auto [x, y] = q.front();
            q.pop();
            for (auto e : inv[x]) {
                if (e == y || vis[e]) continue;
                adj[x].emb(e), vis[e] = true, cnt++, q.em(e, x);
            }
        }
        if (cnt != n) continue;
        ve<int> val(n);
        dfs(i, -1, adj, val);
        int sum = 0;
        for (auto e : val) sum += e;
        mn = min(mn, sum);
    }
    cout << mn;
}

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