Submission #877510

#	Time	Username	Problem	Language	Result	Execution time	Memory
877510		Beerus13	Bosses (BOI16_bosses)	C++14	100 / 100	408 ms	852 KiB

bosses

#include <bits/stdc++.h>
using namespace std;
#define ll long long
const int N = 5e3 + 5;

int n;
vector<int> g[N];
int dp[N];

int bfs(int u) {
    queue<int> q;
    memset(dp, 0, sizeof(dp));
    dp[u] = 1;
    q.push(u);
    while(q.size()) {
        int s = q.front(); q.pop();
        for(int t : g[s]) if(dp[t] == 0) {
            dp[t] = dp[s] + 1;
            q.push(t);
        }
    }
    int res = 0;
    for(int i = 1; i <= n; ++i) {
        res += dp[i];
        if(dp[i] == 0) return 1e9;
    }
    return res;
}

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    cin >> n;
    for(int i = 1; i <= n; ++i) {
        int k, x; cin >> k;
        while(k--) {
            cin >> x;
            g[x].push_back(i);
        }
    }
    int ans = 1e9;
    for(int i = 1; i <= n; ++i) ans = min(ans, bfs(i));
    cout << ans << '\n';
    return 0;
}

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