arbori

#include <iostream>
#include <fstream>
using namespace std;


int main()
{
    int i,n,st[100],dr[100];
    ifstream fin("date.in");
    ofstream fout("date.out");

    fin>>n;
    for(i=1;i<=n;i++)
        fin>>st[i]>>dr[i];
    fout<<"frunzele: ";
    for(i=1;i<=n;i++)
        if(st[i]==0 && dr[i]==0) fout<<i<<" ";
    fout<<"\nvarfurile cu un singur descendent: ";
    for(i=1;i<=n;i++)
        if(st[i]*dr[i]==0 && st[i]+dr[i]!=0) fout<<i<<" ";
    fout<<"\nvarfurile cu doi descendenti: ";
    for(i=1;i<=n;i++)
        if(st[i] && dr[i]) fout<<i<<" ";
    fin.close();
    fout.close();
    return 0;
}