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- #include <fstream>
- using namespace std;
- ifstream f("cin.in");
- ofstream g("cout.out");
- int n,m,i,x,y,ge[1001],gi[1001],v[1001],nr,a[1001][1001],k,j,u,p,c[1001],viz[1001],nod;
- int main()
- {f>>n>>m;
- for(i=1;i<=m;++i)
- {f>>x>>y;
- a[x][y]=1;
- }
- for(k=1;k<=n;++k)
- for(i=1;i<=n;++i)
- for(j=1;j<=n;++j)
- if(a[i][j]==0)
- a[i][j]=a[i][k]*a[k][j];
- for(i=1;i<=n;++i)
- {for(j=1;j<=n;++j)
- if(a[j][i]==0 && i!=j)
- break;
- if(j>n)
- {k=i;
- break;}}
- g<<k<<'\n';
- return 0;
- }
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