Submission #1097488

#	Time	Username	Problem	Language	Result	Execution time	Memory
1097488		alexander707070	Newspapers (CEOI21_newspapers)	C++14	0 / 100	1078 ms	221520 KiB

newspapers

#include<bits/stdc++.h>
#define MAXN 200007
using namespace std;
 
int n,m,a,b;
vector<int> v[MAXN],to[1<<22];
bool li[1<<22];

bool dfs(int x,int y){
    if(x==y)return true;

    li[x]=true;
    for(int i:to[x]){
        if(!li[i] and dfs(i,y))return true;
    }

    return false;
}

int main(){

    cin>>n>>m;
    for(int i=1;i<=m;i++){
        cin>>a>>b;
        a--; b--;
        v[a].push_back(b);
        v[b].push_back(a);
    }

    for(int i=0;i<(1<<n);i++){
        for(int f=0;f<n;f++){
            int res=0;

            for(int t=0;t<n;t++){
                if(((1<<t)&i)>0){
                    for(int s:v[t])res|=(1<<s);
                }
            }
            
            if((res&(1<<f))>0)res^=(1<<f);

            to[i].push_back(res);
        }
    }

    if(dfs((1<<n)-1,0)){
        cout<<"YES\n";
        cout<<"1\n1\n";
    }else{
        cout<<"NO\n";
    }
 
    return 0;
}

• Subtask 1: 0 / 12
• Subtask 2: 0 / 8
• Subtask 3: 0 / 80