Submission #485802

#	Time	Username	Problem	Language	Result	Execution time	Memory
485802		radal	Bosses (BOI16_bosses)	C++14	100 / 100	666 ms	680 KiB

bosses

#include <bits/stdc++.h>
#pragma GCC optimize("O2")
#pragma GCC target("avx2,fma")
#define rep(i,l,r) for (int i = l; i < r; i++)
#define repr(i,r,l) for (int i = r; i >= l; i--)
#define X first
#define Y second
#define mp make_pair
#define pb push_back
#define endl '\n'
#define debug(x) cerr << #x << " : " << x << endl;
using namespace std;
typedef long long ll;
typedef pair<int,int> pll;
typedef pair<long double,long double> pld;
const long long int N = 5e3+10,mod = 998244353,inf = 1e18,maxm = (1 << 24);
inline int mkay(int a,int b){
    if (a+b >= mod) return a+b-mod;
    if (a+b < 0) return a+b+mod;
    return a+b;
}
inline int poww(int n,ll k){
    int c = 1;
    while (k){
        if (k&1) c = (1ll*c*n)%mod;
        n = (1ll*n*n)%mod;
        k >>= 1;
    }
    return c;
}
int sz[N],d[N];
vector<int> adj[N];
bool vis[N];
void bfs(int v){
    d[v] = 0;
    vis[v] = 1;
    queue <int> q;
    q.push(v);
    while (!q.empty()){
        int u = q.front();
        q.pop();
        for (int w : adj[u]){
            if (!vis[w]){
                q.push(w);
                d[w] = d[u]+1;
                vis[w] = 1;
            }
        }
    }
}
int main(){
    ios :: sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int n;
    cin >> n;
    rep(i,1,n+1){
        cin >> sz[i];
        rep(j,0,sz[i]){
            int u;
            cin >> u;
            adj[u].pb(i);
        }
    }
    ll ans = inf;
    rep(i,1,n+1){
        bfs(i);
        ll cost = 0;
        bool f = 0;
        rep(i,1,n+1){
            if (!vis[i]){
                f = 1;
                continue;
            }
            cost += d[i]+1;
            vis[i] = 0;
        }
        if (!f) ans = min(ans,cost);
    }
    cout << ans;
    return 0;
}

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