Submission #273860

#	Time	Username	Problem	Language	Result	Execution time	Memory
273860		erkam	Bosses (BOI16_bosses)	C++17	0 / 100	8 ms	12032 KiB

bosses

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cmath>
#include<utility>
#include<vector>
#include<stack>
#include<queue>
#include<cstring>
#include<set>
#include<map>
#define endl "\n"
#define all(v) v.begin(),v.end()
#define st first
#define nd second
#define mp make_pair
#define pb push_back
using namespace std;
typedef long long lo;
const int mod=1000000007,N=500005;
lo a,b,c,d,e,f,g=1,h[N],arr[N];
string s;
vector<lo>v[N];

lo bfs(lo x){
	for(lo i=1;i<=a;i++)h[i]=0;
	queue<pair<lo,lo> >q;
	q.push({x,1});
	while(q.size()){
		if(h[q.front().st]){q.pop(); continue;}
		h[q.front().st]=q.front().nd;
		for(lo i=0;i<v[q.front().st].size();i++){
			if(h[v[q.front().st][i]]==0)q.push({v[q.front().st][i],q.front().nd+1});
		}
		q.pop();
	}
	lo sum=0;
	for(lo i=1;i<=a;i++){
		if(h[i]==0) return mod;
		sum+=h[i];
	}
	return sum;
}

void solve(){
	cin >> a;
	for(lo i=1;i<=a;i++){
		lo x,y;
		cin >> x;
		for(lo j=1;j<=x;j++){
			cin >> y;
			v[y].pb(x);
		}
	}
	lo mn=mod;
	for(lo i=1;i<=a;i++){
		for(lo j=1;j<=a;j++)h[j]=0;
		mn=min(mn,bfs(i));
	}
	cout << mn << endl;
}
 
int main(){
	#ifdef local
		freopen("in.txt","r",stdin);
		freopen("out.txt","w",stdout);
	#endif
	ios_base::sync_with_stdio(false);
	cin.tie(NULL); cout.tie(NULL);
	// cin >> g;
	while(g--)solve();
}

Compilation message (stderr)

bosses.cpp: In function 'lo bfs(lo)':
bosses.cpp:32:15: warning: comparison of integer expressions of different signedness: 'lo' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |   for(lo i=0;i<v[q.front().st].size();i++){
      |              ~^~~~~~~~~~~~~~~~~~~~~~~

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