Submission #779354

#	Time	Username	Problem	Language	Result	Execution time	Memory
779354		FEDIKUS	Newspapers (CEOI21_newspapers)	C++17	50 / 100	155 ms	8236 KiB

newspapers

#include<bits/stdc++.h>

using namespace std;

const int maxn=1010;
bool moze=true;

vector<int> g[maxn];

int dfs(int node,int parent=-1){
    int ret=0;
    int klk=0;
    for(int i:g[node]){
        if(i==parent) continue;
        auto temp=dfs(i,node);
        ret=max(ret,temp);
        if(temp>2) klk++;
    }
    if(klk>2) moze=false;
    ret++;
    return ret;
}

int main(){
    int n,m;
    cin>>n>>m;
    for(int i=1;i<=m;i++){
        int u,v;
        cin>>u>>v;
        g[u].push_back(v);
        g[v].push_back(u);
    }
    if(m!=n-1){
        cout<<"NO\n";
        return 0;
    }
    for(int i=1;i<=n;i++) dfs(i);
    if(moze) cout<<"YES\n1\n1";
    else cout<<"NO\n";
    return 0;
}
/*
7 6
1 2
1 3
1 4
1 5
1 6
1 7

6 6
1 2
2 3
3 1
1 4
2 5
3 6
*/

• Subtask 1: 6 / 12
• Subtask 2: 4 / 8
• Subtask 3: 40 / 80