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>
using namespace std;
#define int long long
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;
}
if(n==1) cout<<"YES\n"<<"1 1"<<"\n";
else if(n==2) cout<<"YES\n"<<"2 1 1"<<"\n";
else
{
cout<<"YES\n"<<n*2-4<<" \n";
for(int i=2; i<n; i++)
{
cout<<i<<" "<<i<<" ";
}
}
}
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