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 suiii ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define ll long long
#define co cout<<
//#pragma GCC optimize("O3,Ofast,unroll-loops")
//#pragma GCC target("avx2,sse3,sse4,avx")
using namespace std;
//stuff
ll n,m;
bool del[3005];
bool mat[3005][3005];
void solve(){
cin>>n>>m;
for(int i=1;i<=m;i++){
ll a,b;
cin>>a>>b;
mat[a][b]=1;
mat[b][a]=1;
}
for(int i=1;i<=n;i++){
if(del[i]) continue;
for(int j=1;j<=n;j++){
if(del[j]) continue;
if(mat[i][j]==0){
del[i]=1;
del[j]=1;
}
}
}
ll num=0;
for(int i=1;i<=n;i++){
if(del[i]==0&&num<n/3){
co i<<' ';
num++;
}
}
}
int main()
{
suiii
int t=1;
// cin>>t;
while(t--){
solve();
}
return 0;
}
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