Submission #1313011

#	Time	Username	Problem	Language	Result	Execution time	Memory
1313011		neonglitch	Norela (info1cup18_norela)	C++20	0 / 100	19 ms	440 KiB

norela

#include <iostream>
#include <vector>
using namespace std;
typedef long long ll;
#define int ll
const int P=100;
ll s[P],pw2[P];
main()
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	pw2[0]=1;
	for(int i=1;i<62;i++)pw2[i]=pw2[i-1]*2ll;
	int n,m;
	cin>>n>>m;
	if(n==0)
	{
		cout<<(1/0)<<endl;
	}
	for(int i=0;i<m;i++)
	{
		int sz;
		cin>>sz;
		for(int j=0;j<sz;j++)
		{
			int x;
			cin>>x;
			x--;
			s[i]|=pw2[x];
		}
	}
	bool posl=0;
	int cn=m+200,ap=pw2[m];
	for(int mk=0;mk<pw2[m];mk++)
	{
		ll fnl=0;
		int cnt=0;
		for(int i=0;i<m;i++)
		{
			if(mk&pw2[i])
			{
				cnt++;
				fnl^=s[i];
			}
		}
		if(fnl==(pw2[n]-1))
		{
			posl=1;
			if(cnt<cn)
			{
				cn=cnt;
				ap=mk;
			}
			else if (cnt==cn and mk<ap){
				ap=mk;
			}
		}
	}
	if(!posl)
	{
		cout<<(1/0)<<endl;
		return 0;
	}
	cout<<cn<<endl;
	for(int i=0;i<m;i++)
	{
		if((ap>>i)&1)
		{
			cout<<i+1<<' ';
		}
	}
	cout<<endl;
}

Compilation message (stderr)

norela.cpp:8:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    8 | main()
      | ^~~~
norela.cpp: In function 'int main()':
norela.cpp:19:25: warning: division by zero [-Wdiv-by-zero]
   19 |                 cout<<(1/0)<<endl;
      |                        ~^~
norela.cpp:62:25: warning: division by zero [-Wdiv-by-zero]
   62 |                 cout<<(1/0)<<endl;
      |                        ~^~

• Subtask 1: 0 / 20
• Subtask 2: 0 / 30
• Subtask 3: 0 / 25
• Subtask 4: 0 / 25