This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
#define MAXN 600007
using namespace std;
int n,m,a,b;
vector<int> v[MAXN];
int main(){
cin>>n>>m;
for(int i=1;i<=m;i++){
cin>>a>>b;
v[a].push_back(b);
v[b].push_back(a);
}
if(m>n-1){
cout<<"NO\n";
return 0;
}
for(int i=1;i<=n;i++){
if(v[i].size()<=2)continue;
int br=0;
for(int f:v[i]){
if(v[f].size()>1)br++;
}
if(br>2){
cout<<"NO\n";
return 0;
}
}
cout<<"YES\n1\n1\n";
return 0;
}
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