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Thread: basic binary search tree implementation

  1. #1
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    Default basic binary search tree implementation

    public class BST<Key extends Comparable<Key>,Value>{

    private Node root;

    private class Node{
    private Key key;
    private Value val;
    private Node left, right;
    private int N;

    public Node(Key key,Value val,int N)
    { this.key = key; this.val=val; this.N=N;}
    }
    return size(root);
    }
    public int size(Node x){
    if(x==null) return 0;
    else
    return x.N;
    public int size(){
    }
    public Value get(Key key){
    return get(root,key);
    }
    private Value get(Node x, Key key){
    if(x==null) return null;
    int cmp = key.compareTo(x.key);
    if (cmp<0) return get(x.left,key);
    else if (cmp<0) return get(x.right,key);
    else return x.val;
    }
    public Node put(Key key,Value val){
    root = put(root,Key,val);
    }
    private Node put(Node x, Key key, Value val){
    if(x==null ) return new Node(key ,val,1);
    int cmp =key.compareTo(x.key);
    if(cmp<0) x.left= put(x.left,key,val);
    else if(cmp>0) x.right= put(x.right,key,val);
    else x.val=val;
    x.N=size(x.left)+size(x.right)+1;
    return x;
    }

    public Key min(){
    return min(root).key;
    }
    private Node min(Node x){
    if(x.left==null) return x;
    return min(x.left);
    }
    public Key max(){
    return min(root).key;
    }
    private Node max(Node x){
    if(x.right==null) return x;
    return max(x.right);
    }
    public Key select(int k){
    return select(root,k).key;
    }
    private Node select(Node x,int k)
    {
    if(x=null)return null;
    int t=size(x.left);
    if(t>k) return(x.left,k);
    else if(t<k) return(x.right,k-t-1);
    else return x;
    }
    public int rank(Key key,Node x)
    { return rank(key,root); }
    private int rank(Key key,Node x){
    if(x==null) return 0;
    int cmp =key.compareTo(x.key);
    if(cmp<0) return rank(key,x.left);
    else if(cmp>0) return 1+size(x.left)+rank(key,x.right);
    else return size(x.left);
    }
    public void deleteMin(){
    root= deleteMin(root);
    }
    private Node deleteMin(Node x){
    if(x.left==null) return x.right;
    x.left=deleteMin(x.left);
    x.N =size(x.left)+size(x.right)+1;
    return x;
    }

    public void delete(Key key){
    root=delete(root,key)
    }
    private Node delete(Node x,Key key){
    if(x==null) return null;
    int cmp = key.compareTo(x.key);
    if(cmp<0)x.left = delete(x.left,key);
    else if(cmp>0) x.right= delete(x.right,key);
    else{
    if(x.right==null) return x.left;
    if(x.left==null) return x.right;
    Node t =x;
    x=min(t.right);
    x.right=deleteMin(t.right);
    x.left=t.left;
    }
    x.N=size(x.left)+size(x.right)+1;
    return x;
    }

    }

    --- Update ---

    ive got this from the internet but when i debug it.. it does'nt work (many errors ! what should i do)


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: basic binary search tree implementation

    Please edit your post and wrap your code with code tags:
    [code=java]
    <YOUR CODE HERE>
    [/code]
    to get highlighting and preserve formatting.
    it does'nt work (many errors !
    If you are getting error messages, copy the full text and paste it here. Otherwise please explain about the errors and "doesn't work".
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: basic binary search tree implementation

    I say get the algo then build yourself it will be easy for you to debug.
    And please wrap your post in [code] tags

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