How to Fix BST Search Errors

In this tutorial, you'll learn about How to Fix BST Search Errors. We cover key concepts, practical examples, and best practices.

Fix bst search errors when comparison inverted or BST properties not utilized.

Quick Fix

Wrong

def search(r,v):
    cur=r
    while cur:
        if cur.val==v: return cur
        cur=cur.left if v<cur.val else cur.right
    return None

Correct version. Common mistake: reversed comparison direction.

Right

def search(r,v):
    cur=r
    while cur:
        if cur.val==v: return cur
        cur=cur.left if v<cur.val else cur.right
    return None

BST [5,3,7,2,4,6,8], search(4) -> node 4. O(log n) avg.

Prevention

Use iterative while loop. Compare and branch correct direction.

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FAQ