Submission #742207

#	Time	Username	Problem	Language	Result	Execution time	Memory
742207		sword060	Logičari (COCI21_logicari)	C++17	20 / 110	57 ms	340 KiB

Main

#include <bits/stdc++.h>
using namespace std;
int main(){
	ios::sync_with_stdio(0);cin.tie(0);
	int x; cin>>x;
	if(x>20){
		cout<<(x%4?-1:x/2);
		return 0;
	}
	vector<int>v[x];
	for(int i=1;i<=x;i++){
		int l,r;cin>>l>>r;
		l--;r--;
		v[l].push_back(r);
		v[r].push_back(l);
	}
	int ans=1e9;
	for(int i=1;i<(1<<x);i++){
		bool f=1;
		for(int j=0;j<x;j++){
			int cnt=0;
			for(auto c:v[j])
				if(i&(1<<c))cnt++;
			f&=(cnt==1);
		}
		if(f)
			ans=min(ans,__builtin_popcount(i));
	}
	cout<<(ans==1e9?-1:ans);
	return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 0 / 40
• Subtask 4: 0 / 50