Poj Solution 2418

http://poj.org/problem?id=2418

import java.io.BufferedReader;   
import java.io.IOException;   
import java.io.InputStreamReader;   
  
public class Main {   
       
    public static class TreeNode{   
        private String species;   
        private TreeNode left;   
        private TreeNode right;   
        private int count;   
           
    }   
       
    public static class Tree{   
        private int total;   
        private TreeNode root=new TreeNode();   
  
        public void insert(String newSpecies,TreeNode root){   
            if(root.count==0){   
                   
                root.species=newSpecies;   
                root.count++;   
                total++;   
                return;   
                   
            }   
            else{   
                if(root.species.compareTo(newSpecies)>0){   
                       
                    if(root.left==null){   
                           
                        root.left=new TreeNode();   
                           
                    }   
                    insert(newSpecies,root.left);   
                       
                }else{   
                       
                    if(root.species.compareTo(newSpecies)<0){   
                           
                        if(root.right==null){   
                               
                            root.right=new TreeNode();   
                               
                        }   
                        insert(newSpecies,root.right);     
                           
                    }else{   
                           
                        root.count++;   
                        total++;   
                           
                    }   
                       
                }   
                   
            }   
               
        }   
           
        public void travelTree(TreeNode root){   
               
            if(root==null){   
                   
                return;   
                   
            }   
            travelTree(root.left);   
            System.out.print(root.species+" ");   
            double p=(double)root.count*100/total;   
            System.out.printf("%.4f", p);   
            System.out.println();   
            travelTree(root.right);   
               
        }   
           
    }   
       
    public static void main(String[] args){   
           
        BufferedReader reader=new BufferedReader(new InputStreamReader(System.in));   
        Tree t=new Tree();   
        String s;   
           
        try {   
            while((s=reader.readLine())!=null){   
  
                t.insert(s,t.root);   
  
            }   
  
        } catch (IOException e) {   
            // TODO Auto-generated catch block   
            e.printStackTrace();   
        }   
        t.travelTree(t.root);   
           
    }   
  
}