Submission #973743

#	Time	Username	Problem	Language	Result	Execution time	Memory
973743		a_l_i_r_e_z_a	Bosses (BOI16_bosses)	C++17	100 / 100	450 ms	728 KiB

bosses

// In the name of God
// Hope is last to die

#include <bits/stdc++.h>
using namespace std;
 
#pragma GCC optimize("O3,unroll-loops")
// #pragma GCC optimize("avx2")

typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

#define pb push_back
// #define int long long
#define S second
#define F first
#define mp make_pair
#define smax(xyxy, yxy) (xyxy) = max((xyxy), (yxy))
#define smin(xyxy, yxy) (xyxy) = min((xyxy), (yxy))
#define all(xyxy) (xyxy).begin(), (xyxy).end()
#define len(xyxy) ((int)(xyxy).size())

const int maxn = 5000 + 5;
const int inf = 1e9 + 7;
int n, d[maxn];
vector<int> adj[maxn];
queue<int> q;

ll bfs(int v){
    memset(d, 63, sizeof d);
    while(q.size()) q.pop();
    d[v] = 0;
    q.push(v);
    while(q.size()){
        v = q.front();
        q.pop();
        for(auto u: adj[v]){
            if(d[u] > d[v] + 1){
                d[u] = d[v] + 1;
                q.push(u);
            }
        }
    }
    ll res = 0;
    for(int i = 0; i < n; i++) res += d[i]; 
    return res;
}

int32_t main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    
    cin >> n;
    for(int i = 0; i < n; i++){
        int k; cin >> k;
        for(int j = 0; j < k; j++){
            int u; cin >> u;
            u--;
            adj[u].pb(i);
        }
    }
    ll ans = inf;
    for(int i = 0; i < n; i++) smin(ans, bfs(i));
    cout << ans + n << '\n';

    return 0;
}

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