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- #include <fstream>
- using namespace std;
- ifstream fin("gradk.in");
- ofstream fout("gradk.out");
- int n,k,A[101][101],gk;
- int grad(int v)
- {
- int c=0;
- for(int i=1;i<=n;i++)
- if(A[v][i]) c++;
- return c;
- }
- int main()
- {
- fin>>n>>k;
- int x,y;
- while(fin>>x>>y)
- A[x][y]=A[y][x]=1;
- for(int i=1;i<=n;i++)
- if(grad(i)==k) gk++;
- if(gk)
- {
- fout<<gk<<" ";
- for(int i=1;i<=n;i++)
- if(grad(i)==k) fout<<i<<" ";
- }
- else fout<<"NU EXISTA";
- return 0;
- }
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