BST Search Completion Failure

BST Search Completion Failure | Generated by AI

Home 2026.06

Here’s the exact prompt and response side by side:

=== PROMPT INPUT (prompt_java.txt, lines 1-48) ===

import java.util.*;

public class BinarySearchTree { private Node root;

  static class Node {
      int key;
      Node left, right;

      public Node(int item) {
          key = item;
          left = right = null;
      }
  }

  public BinarySearchTree() {
      root = null;
  }

  void insert(int key) {
      root = insertRec(root, key);
  }

  Node insertRec(Node root, int key) {
      if (root == null) {
          root = new Node(key);
          return root;
      }
      if (key < root.key)
          root.left = insertRec(root.left, key);
      else if (key > root.key)
          root.right = insertRec(root.right, key);
      return root;
  }

  void inorder() {
      inorderRec(root);
  }

  void inorderRec(Node root) {
      if (root != null) {
          inorderRec(root.left);
          System.out.println(root.key);
          inorderRec(root.right);
      }
  }

  boolean search(int key) {        <--- prompt ends here

=== MODEL CONTINUATION (300 new tokens, temp=0.8, top_k=200) ===

               return;              <--- garbage start immediately
       }
   }
   public String get(String source)
       { return text;
    }
     }
            return true  Property.TrveradataValue;   }
public Listi static
   {
        return new }  null;
       int() (int) {
             return new.Invalid(this.nameOf.Value);
    }
      this.value.n, this.v.S.S.S.S);
     }
         }
   return this.tree.GetAttribute(parent(this.name));

=== END ===

The prompt (a complete BST with insert/inorder/search stub) was replayed verbatim. Then immediately after boolean search(int key) {, the model produced:

return; – valid Java syntax but wrong (search should return boolean)
public String get(String source) – wrong method, wrong class
Property.TrveradataValue – not a real Java construct
this.v.S.S.S.S) – nonsensical chained access
this.tree.GetAttribute(parent(this.name)) – looks like some DOM/JavaScript pattern leaking in

The model clearly memorized the BST class from training data, but has no ability to complete the search method coherently.

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