Submission #450398

#	Time	Username	Problem	Language	Result	Execution time	Memory
450398		Hamed5001	Bosses (BOI16_bosses)	C++14	0 / 100	3 ms	1560 KiB

bosses

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

const int mxN = 5e4+10;
int n;
vector<int> adj[mxN];

int bfs(int st) {
	vector<bool> vis(n+10, 0);
	queue<pair<int ,int>> q;
	q.push({1, st});
	int ret = 0;
	vis[st] = 1;
	while(q.size()) {
		auto node = q.front();
		ret += node.first;
		vis[node.second] = 1;
		q.pop();

		for (auto it : adj[node.second]) {
			if (!vis[it]) {
				q.push({node.first+1, it});
			}
		}
	}
	return ret;
}


void solve() {
	cin >> n;
	for (int u = 1; u <= n; u++) {
		int k;
		cin >> k;
		for (int j = 0; j < k; j++) {
			int v;
			cin >> v;
			adj[v].push_back(u);
		}
	}

	int ans = INT_MAX;
	for (int i = 1; i <= n; i++) {
		ans = min(ans, bfs(i));
	}

	cout << ans;
}	

int main() {
#ifndef ONLINE_JUDGE
	freopen("input.txt", "r", stdin);
	freopen("output.txt", "w", stdout);
#endif
	
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	solve();
}

Compilation message (stderr)

bosses.cpp: In function 'int main()':
bosses.cpp:54:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   54 |  freopen("input.txt", "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
bosses.cpp:55:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 |  freopen("output.txt", "w", stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 22
• Subtask 2: 0 / 45
• Subtask 3: 0 / 33