Submission #691775

#	Time	Username	Problem	Language	Result	Execution time	Memory
691775		MateiKing80	Norela (info1cup18_norela)	C++14	100 / 100	98 ms	344 KiB

norela

#include <bits/stdc++.h>
using namespace std;

int sol,nrsol=2100000000,n,m;
long long vr[30];

void bkt(long long nrc, int poz, int ans, int cnt)
{
    if(poz==m)
    {
        if(nrc==((long long)1<<n)-1)
        {
            if(nrsol>cnt)
            {
                nrsol=cnt;
                sol=ans;
            }
        }
        return ;
    }
    bkt(nrc^vr[poz],poz+1,ans^(1<<poz),cnt+1);
    bkt(nrc,poz+1,ans,cnt);
}
int main()
{
    cin.sync_with_stdio(false);
    cin.tie(0);
    cin>>n>>m;
    for(int i=0; i<m; i++)
    {
        int q;
        cin>>q;
        for(int j=0; j<q; j++)
        {
            int x;
            cin>>x;
            x--;
            vr[i]^=((long long)1<<(x));
        }
    }
    bkt(0,0,0,0);
    cout<<nrsol<<'\n';
    for(int i=0; i<=m-1; i++)
        if(sol&(1<<i))
            cout<<i+1<<" ";
    cout<<'\n';
    return 0;
}

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