How to Fix BST Insertion Errors

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

Fix bst insertion errors when duplicate handling ambiguous or insertion position miscalculated.

Quick Fix

Wrong

def ins(r,v):
    if not r: return TreeNode(v)
    if v<r.val: r.left=ins(r.left,v)
    else: r.right=ins(r.right,v)
    return r

Duplicates go right without explicit handling.

Right

def ins(r,v):
    if not r: return TreeNode(v)
    if v<r.val: r.left=ins(r.left,v)
    elif v>r.val: r.right=ins(r.right,v)
    return r

Insert 4 into [2,1,3] -> BST maintained. O(log n) avg.

Prevention

Handle duplicates explicitly (skip or left/right convention). Consistent comparison.

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