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How to Solve Lowest Common Ancestor of a Binary Search Tree Problem
Master the Lowest Common Ancestor of a Binary Search Tree LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsMedium#235
LeetCode ProblemLowest Common Ancestor of a Binary Search Tree
Given a binary search tree (BST), find the lowest common ancestor (LCA) node of two given nodes in the BST. According to the definition of LCA on Wikipedia: “The lowest common ancestor is defined between two nodes p and q as the lowest node in T that has both p and q as descendants (where we allow a node to be a descendant of itself).”
TreeDepth-First SearchBinary Search TreeBinary Tree
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Problem Breakdown
Understanding the Lowest Common Ancestor of a Binary Search Tree Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
Given a binary search tree (BST), find the lowest common ancestor (LCA) node of two given nodes in the BST. According to the definition of LCA on Wikipedia: “The lowest common ancestor is defined between two nodes p and q as the lowest node in T that has both p and q as descendants (where we allow a node to be a descendant of itself).”
MediumProblem #235
LeetCodeLowest Common Ancestor of a Binary Search Tree
Related Topics
TreeDepth-First SearchBinary Search TreeBinary Tree
How Phantom Code Helps
Get real-time assistance for Lowest Common Ancestor of a Binary Search Tree problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
root = [6,2,8,0,4,7,9,null,null,3,5], p = 2, q = 8
Output
6
# Example 2
Input
root = [6,2,8,0,4,7,9,null,null,3,5], p = 2, q = 4
Output
2
# Example 3
Input
root = [2,1], p = 2, q = 1
Output
2
Constraints
The number of nodes in the tree is in the range [2, 105].
-109 <= Node.val <= 109
All Node.val are unique.
p != q
p and q will exist in the BST.
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Solve Lowest Common Ancestor of a Binary Search Tree — Given a binary search tree (BST), find the lowest common ancestor (LCA) node of ...
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def solve(input):
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Frequently Asked Questions
Common questions about solving Lowest Common Ancestor of a Binary Search Tree and using Phantom Code during coding interviews.
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What coding mistakes does Phantom Code help me avoid during Lowest Common Ancestor of a Binary Search Tree interviews?
Phantom Code catches common mistakes like off-by-one errors, missing edge cases, incorrect base conditions, and suboptimal approaches. It provides clean, well-structured code that handles all edge cases.
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The AI provides structured guidance: first the approach (what algorithm/data structure to use and why), then the implementation with clean code, and finally complexity analysis. This helps you think clearly even under pressure.
Does Phantom Code work for the coding platforms used in Lowest Common Ancestor of a Binary Search Tree interviews?
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