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- #include <fstream>
- using namespace std;
- ifstream f("retea1.in");
- ofstream g("retea1.out");
- int n,A[15001];
- char c[15001],V[15001];
- int main()
- {
- int i,j,x;
- f>>n;
- f.get();
- for(i=1;i<=n;++i)
- {
- V[i]=0;
- f.get(c,15001);
- f.get();
- for(j=0;j<n;++j)
- if(c[2*j]=='1')
- A[i]=j+1;
- }
- for(i=1;i<=n;++i)
- if(V[i]==0)
- {
- x=i;
- for(int j=1;j<=n;++j)
- if(V[j]==1)
- V[j]=0;
- while(V[x]!=2)
- ++V[x],x=A[x];
- }
- for(i=1,x=0;i<=n;++i)
- if(V[i]==2)
- ++x;
- g<<'{';
- for(i=1;i<=n;++i)
- if(V[i]==2)
- {
- if(--x>0)
- g<<i<<',';
- else
- g<<i;
- }
- g<<'}';
- g.close();
- return 0;
- }
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