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happyZYM
2023-08-03 09:22:52 +08:00
commit de60cd6ed4
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history_source/信息学奥赛一本通/3.4.4.1.cpp Normal file
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#include<cstdio>
#define maxn 200
int fa[maxn+1],n,t,i,j,k,ans;
bool w[maxn+1][maxn+1];
int main()
{
freopen("cdrom.in","r",stdin);
freopen("cdrom.out","w",stdout);
scanf("%d",&n);
for(i=1;i<=n;i++)
{
while(scanf("%d",&t),t>0) w[i][t]=1;
fa[i]=i;
}
for(k=1;k<=n;k++)
for(i=1;i<=n;i++)
for(j=1;j<=n;j++)
w[i][j]=w[i][j]||(w[i][k]&&w[k][j]);
for(i=1;i<=n;i++)
for(j=1;j<=n;j++)
if(w[i][j]) fa[j]=fa[i];
for(i=1;i<=n;i++) if(fa[i]==i) ans++;
printf("%d\n",ans);
return 0;
}