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- #include <iostream>
- using namespace std;
- int n,a[101][101],viz[101],x,y,nrtc,m;
- void citire()
- {
- cin>>n>>m;
- for(int i=1; i<=m; i++)
- cin>>x>>y,a[x][y]=1;
- }
- void rw()
- {
- for(int k=1; k<=n; k++)
- for(int i=1; i<=n; i++)
- for(int j=1; j<=n; j++)
- {
- if(i!=k && j!=k && !a[i][j])
- a[i][j]=a[i][k]*a[k][j];
- }
- }
- int main()
- {
- citire();
- rw();
- for(int i=1;i<=n;i++)
- if(!viz[i])
- {
- nrtc++;
- for(int j=1;j<=n;j++)
- if(a[i][j]+a[j][i]==2)
- viz[j]=nrtc;
- }
- cout<<nrtc;
- return 0;
- }
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