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Plz Help with my java code

import java.io.*;
import java.util.*;

class Main
{
Arbol tree;
int cont;
int de;
public static void main(String args[])
{
Main myWork = new Main();
myWork.Begin();
}
public int teur(long n)
{
int temp = tree.buscar(n);
//System.out.println(n);
if(n==1 ...