Submission #1276327

#	Time	Username	Problem	Language	Result	Execution time	Memory
1276327		SmuggingSpun	Bosses (BOI16_bosses)	C++20	100 / 100	375 ms	732 KiB

bosses

#include<bits/stdc++.h>
#define taskname "A"
using namespace std;
const int lim = 5e3 + 5;
template<class T>void minimize(T& a, T b){
	if(a > b){
		a = b;
	}
}
int n, ans = INT_MAX;
vector<int>g[lim];
void bfs(int s){
	vector<int>h(n + 1, 0);
	queue<int>q;
	q.push(s);
	h[s] = 1;
	while(!q.empty()){
		int u = q.front();
		q.pop();
		for(int& v : g[u]){
			if(h[v] == 0){
				h[v] = h[u] + 1;
				q.push(v);
			}
		}
	}
	if(*min_element(h.begin() + 1, h.end()) > 0){
		minimize(ans, accumulate(h.begin(), h.end(), 0));
	}
}
int main(){
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	if(fopen(taskname".inp", "r")){
		freopen(taskname".inp", "r", stdin);
	}
	cin >> n;
	for(int i = 1; i <= n; i++){
		int k;
		cin >> k;
		for(int j = 0; j < k; j++){
			int x;
			cin >> x;
			g[x].push_back(i);
		}
	}
	for(int i = 1; i <= n; i++){
		bfs(i);
	}
	cout << ans;
}

Compilation message (stderr)

bosses.cpp: In function 'int main()':
bosses.cpp:34:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |                 freopen(taskname".inp", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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