How to Fix Inorder Binary Tree Traversal Errors

In this tutorial, you'll learn about How to Fix Inorder Binary Tree Traversal Errors. We cover key concepts, practical examples, and best practices.

Fix inorder binary tree traversal errors when recursive stack overflows on deep trees.

Quick Fix

Wrong

def inorder(r):
    if not r: return []
    return inorder(r.left)+[r.val]+inorder(r.right)

Stack overflow on deep (1000+) trees.

Right

def inorder(r):
    res,st,cur=[],[],r
    while st or cur:
        while cur: st.append(cur); cur=cur.left
        cur=st.pop(); res.append(cur.val); cur=cur.right
    return res

Input: [1,null,2,3] -> [1,3,2]. Iterative handles deep trees.

Prevention

Use iterative with explicit stack. Handle null children before pushing.

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