Submission #910950

#	Time	Username	Problem	Language	Result	Execution time	Memory
910950		oblantis	Bosses (BOI16_bosses)	C++17	100 / 100	387 ms	772 KiB

bosses

#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#pragma GCC optimize("O3,unroll-loops")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define all(v) v.begin(), v.end()
#define pb push_back
#define ss second
#define ff first
#define vt vector
using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef pair<int, int> pii;
typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;
const int inf = 1e9;
const int mod = 1e9+7;
const int maxn = 1e5 + 1;
void solve() {
	int n;
	cin >> n;
	bool was[n];
	vt<int> v[n];
	for(int i = 0; i < n; i++){
		int k;
		cin >> k;
		for(int j = 0, t; j < k; j++) {
			cin >> t;
			t--;
			v[t].pb(i);
		}
	}
	int sum = n * n;
	for(int i = 0; i < n; i++){
		memset(was, 0, sizeof was);
		queue<pii> q;
		q.push({i, 1});
		was[i] = 1;
		int ans = 0, cnt = 0;
		while(!q.empty()){
			pii nw = q.front();
			q.pop();
			ans += nw.ss;
			cnt++;
			for(auto j : v[nw.ff]){
				if(!was[j])was[j] = 1, q.push({j, nw.ss + 1});
			}
		}
		if(cnt == n)sum = min(sum , ans);
	}
	cout << sum;
}
int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int times = 1;
	//cin >> times;
	for(int i = 1; i <= times; i++) {
		solve();
	}
	return 0;
}

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