```cpp
#include<bits/stdc++.h>
using namespace std;
int a[105][105],b[1000000];
int main(){
int n,p,q;
cin>>n;
for(int i=1;i<=n;i++)
for(int j=1;j<=n;j++)
if(i!=j)a[i][j]=10000000;
for(int i=1;i<n;i++){
cin>>p>>q;
a[p][q]=1;
a[q][p]=2;
}
int ans=0,sum=0;
for(int k=1;k<=n;k++){
for(int i=1;i<=n;i++){
for(int j=1;j<=n;j++)
if(a[i][k]+a[k][j]<a[i][j])
a[i][j]=a[i][k]+a[k][j];
}
}
for(int j=1;j<=n;j++)
if(a[1][j]&&a[1][j]!=10000000){ans=max(ans,a[1][j]);
b[a[1][j]]++;
}
for(int i=0;i<=ans;i++)
sum=max(sum,b[i]);
int l,h;
cin>>l>>h;
cout<<ans+1<<endl<<sum<<endl<<a[l][h];
return 0;
}
```
已AC
by acmwriter @ 2023-07-26 17:36:04