이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include "bits/stdc++.h"
using namespace std;
using ll = long long;
bool v[1006][1006],r[1006];
int main(){
ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
ll n,m;
cin>>n>>m;
for(int i=0;i<m;i++){
ll x,y;
cin>>x>>y;
v[x-1][y-1]=1;
}
for(int i=0;i<n;i++){
if(r[i])continue;
for(int j=i+1;j<n;j++){
if(r[j])continue;
if(!v[i][j]){
r[i]=1;r[j]=1;
break;
}
}
}
ll x=n/3;
for(int i=0;i<n;i++){
if(x==0)break;
if(!r[i]){
x--;
cout<<i+1<<" ";
}
}
}
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