26 lines
500 B
C++
26 lines
500 B
C++
#include<cstdio>
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#define maxn 200
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int fa[maxn+1],n,t,i,j,k,ans;
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bool w[maxn+1][maxn+1];
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int main()
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{
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freopen("cdrom.in","r",stdin);
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freopen("cdrom.out","w",stdout);
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scanf("%d",&n);
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for(i=1;i<=n;i++)
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{
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while(scanf("%d",&t),t>0) w[i][t]=1;
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fa[i]=i;
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}
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for(k=1;k<=n;k++)
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for(i=1;i<=n;i++)
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for(j=1;j<=n;j++)
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w[i][j]=w[i][j]||(w[i][k]&&w[k][j]);
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for(i=1;i<=n;i++)
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for(j=1;j<=n;j++)
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if(w[i][j]) fa[j]=fa[i];
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for(i=1;i<=n;i++) if(fa[i]==i) ans++;
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printf("%d\n",ans);
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return 0;
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}
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