generated_code_by_copilot.java

// generate red-black tree from a list
  void generateRedBlackTree(){
    // create a red-black tree
    // for each node in the list
      // insert the node into the tree
    RedBlackTree tree = new RedBlackTree();
    for(Node node : list){
      tree.insert(node);
    }

  }

  public class RedBlackTree {
    Node root;
    public RedBlackTree(){
      root = null;
    }
    public void insert(Node node){
      root = insert(root, node);
    }
    private Node insert(Node root, Node node){
      if(root == null){
        return node;
      }
      if(node.key < root.key){
        root.left = insert(root.left, node);
      }
      else{
        root.right = insert(root.right, node);
      }
      return root;
    }

    // find the node with the given key
    public Node find(int key){
      return find(root, key);
    }
    private Node find(Node root, int key){
      if(root == null){
        return null;
      }
      if(root.key == key){
        return root;
      }
      if(key < root.key){
        return find(root.left, key);
      }
      else{
        return find(root.right, key);
      }
    }

    // balance the tree
    public void balance(){
      balance(root);
    }
    private void balance(Node root){
      if(root == null){
        return;
      }
      balance(root.left);
      balance(root.right);
      root.balance();
    }

    // print the tree
    public void print(){
      print(root);
    }
    private void print(Node root){
      if(root == null){
        return;
      }
      print(root.left);
      System.out.println(root.key);
      print(root.right);
    }
  }

  public class Node {
    int key;
    Node left;
    Node right;
    Node parent;
    boolean color;
    Node[] adjacent;
    public Node(int key){
      this.key = key;
      this.left = null;
      this.right = null;
      this.parent = null;
      this.color = true;
      this.adjacent = new Node[0];
    }
    public void addAdjacent(Node node){
      Node[] newAdjacent = new Node[adjacent.length + 1];
      for(int i = 0; i < adjacent.length; i++){
        newAdjacent[i] = adjacent[i];
      }
      newAdjacent[adjacent.length] = node;
      adjacent = newAdjacent;
    }
    public void balance(){
      if(color == false){
        return;
      }
      if(parent == null){
        color = false;
        return;
      }
      if(parent.color == false){
        return;
      }
      if(parent.parent == null){
        return;
      }
      if(parent.parent.left == parent){
        if(parent.right == this){
          rotateLeft();
        }
        rotateRight();
        color = false;
        parent.color = false;
        parent.parent.color = true;
      }
      else{
        if(parent.left == this){
          rotateRight();
        }
        rotateLeft();
        color = false;
        parent.color = false;
        parent.parent.color = true;
      }
    }
    public void rotateLeft(){
      Node temp = right;
      right = temp.left;
      temp.left = this;
      temp.parent = parent;
      if(parent != null){
        if(parent.left == this){
          parent.left = temp;
        }
        else{
          parent.right = temp;
        }
      }
      else{
        root = temp;
      }
      this.parent = temp;
    }
    public void rotateRight(){
      Node temp = left;
      left = temp.right;
      temp.right = this;
      temp.parent = parent;
      if(parent != null){
        if(parent.left == this){
          parent.left = temp;
        }
        else{
          parent.right = temp;
        }
      }
      else{
        root = temp;
      }
      this.parent = temp;
    }
   }
 }