이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <iostream>
#include <vector>
#include <set>
using namespace std;
int main()
{
ios::sync_with_stdio(false);
cin.tie(0);
int n, m;
cin >> n >> m;
vector<vector<bool> > g(n, vector<bool>(n, false));
for (int i = 0, a, b; i < m; i++)
{
cin >> a >> b;
a--, b--;
g[a][b] = g[b][a] = true;
}
vector<bool> alive(n, true);
for (int i = 0; i < n; i++) for (int j = 0; j < i; j++)
{
if (alive[i] && alive[j] && !g[i][j])
{
alive[i] = alive[j] = false;
}
}
vector<int> k;
for (int i = 0; i < n; i++) if (alive[i]) k.push_back(i);
for (int i = 0; i < n / 3; i++) cout << k[i] + 1 << " \n"[i == n / 3 - 1];
return 0;
}
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