#include <iostream>

using namespace std;

int main(int a[20][20])
{int n, v[20], i;
cin>>n;
for(i=0;i<n;i++)
cin>>v[i];
int k=0;
for(i=0;i<n;i++)
if(v[i]==0)
k++;
if(k==1)
{for(i=1;i<=n;i++)
for(j=1;j<=n;j++)
a[i][v[i]]=a[v[i]][i]=1;
for(i=1;i<=n;i++)
{for(j=1;j<=n;j++)
cout<<a[i][j]<<" ";
cout<<endl;}
int s=0;
for(i=1;i<n;i++)
for(j=1;j<n;j++)
s=s+a[i];
if(s==2*(n-1))
cout<<"Este arbore";
else
cout<<"Nu e arbore";}
else
cout<<"Nu este arbore";}