Submission #1084100

#	Time	Username	Problem	Language	Result	Execution time	Memory
1084100		ZeroCool	Bosses (BOI16_bosses)	C++14	100 / 100	517 ms	7776 KiB

bosses

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define ld long double
#define ar array

const int LOG = 20;
const int MOD = 1e9 + 7;
const int INF = 1e18;

const int N = 3e5 + 20;

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,avx,bmi,bmi2")

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

int bfs(int x){
    int d[n];
    memset(d, 0, sizeof d);
    d[x] = 1;
    queue<int> q;
    q.push(x);
    while(q.size()){
        int u  = q.front();
        q.pop();
        for(auto v: g[u]){
            if(d[v])continue;
            d[v] = d[u] + 1;
            q.push(v);
        }
    }
    int ans = 0;
    for(int i = 0;i < n;i++){
        if(!d[i])return INF;
        ans += d[i];
    }
    return ans;
}

signed main(){ios_base::sync_with_stdio(false);
    cin>>n;
    for(int i = 0;i < n;i++){
        int k;
        cin>>k;
        while(k--){
            int x;
            cin>>x;
            --x;
            g[x].push_back(i);
        }
    }
    int ans = INF;
    for(int i = 0;i < n;i++)ans = min(ans, bfs(i));
    cout<<ans;
}

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