Submission #620974

#	Time	Username	Problem	Language	Result	Execution time	Memory
620974		berr	Newspapers (CEOI21_newspapers)	C++17	0 / 100	1 ms	340 KiB

newspapers

#include <bits/stdc++.h>
using namespace std;
#define int long long
vector<int> adj[1005], vis(1005);
int flag=1;

int dfs(int x, int y)
{
    vis[x]=1;
    int maxk=0, t=0, s=0;
    for(auto i: adj[x])
    {
        if(i==y) continue;
        else if(vis[i]==1)
        {
            flag=0;

        }
        else
        {
            int z=dfs(i, x);
            if(z>1) t++;
            s++;
            maxk=max(z, maxk);
        }
    }
    if(t>2||(t==2&&s>0)) flag=0;
    return maxk+1;
}
int32_t main()
{
    ios_base::sync_with_stdio(false); cin.tie(0);
    
    int n, m; cin>>n>>m;
    for(int i=0; i<m; i++)
    {
        int x, y; cin>>x>>y;
       adj[x].push_back(y);
       adj[y].push_back(x);
    }

    for(int i=1; i<=n; i++)
    {
        for(int l=1; l<=n; l++) vis[l]=0;
        dfs(i, 0);
    }
    if(flag==0) cout<<"NO\n";
    else
    {
    cout<<"YES\n"<<"2 1 1\n";
    }
}

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