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How to Solve Create Binary Tree From Descriptions Problem

Master the Create Binary Tree From Descriptions LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.

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Medium#2196

LeetCode Problem

Create Binary Tree From Descriptions

You are given a 2D integer array descriptions where descriptions[i] = [parenti, childi, isLefti] indicates that parenti is the parent of childi in a binary tree of unique values. Furthermore, Construct the binary tree described by descriptions and return its root. The test cases will be generated such that the binary tree is valid.

ArrayHash TableTreeBinary Tree

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Problem Breakdown

Understanding the Create Binary Tree From Descriptions Problem

Let's break down this LeetCode problem and understand what makes it challenging in interview settings.

Problem Statement

MediumProblem #2196

LeetCode

Create Binary Tree From Descriptions

How Phantom Code Helps

Get real-time assistance for Create Binary Tree From Descriptions problems during coding interviews. Phantom Code provides instant solutions and explanations.

Examples

# Example 1

Input

descriptions = [[20,15,1],[20,17,0],[50,20,1],[50,80,0],[80,19,1]]

Output

[50,20,80,15,17,19]

# Example 2

Input

descriptions = [[1,2,1],[2,3,0],[3,4,1]]

Output

[1,2,null,null,3,4]

Constraints

1 <= descriptions.length <= 104

descriptions[i].length == 3

1 <= parenti, childi <= 105

0 <= isLefti <= 1

The binary tree described by descriptions is valid.

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Solve Create Binary Tree From Descriptions — You are given a 2D integer array descriptions where descriptions[i] = [parenti, ...

Here's the optimal approach using Array:

def solve(input):

# Optimal O(n) solution

return result

Time: O(n) | Space: O(n)

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We work with Zoom, HackerRank, CodeSignal, CoderPad and other web-based platforms. Check the compatibility note and request a browser link if a specific desktop app is unsupported.

Frequently Asked Questions

Common questions about solving Create Binary Tree From Descriptions and using Phantom Code during coding interviews.

How does Phantom Code help me solve coding problems like Create Binary Tree From Descriptions during interviews?

Phantom Code generates complete solutions instantly with proper complexity analysis, letting you focus on explaining your approach and demonstrating problem-solving skills rather than getting stuck on implementation details during high-pressure situations.

What if the interviewer asks follow-up questions or modifications to problems like Create Binary Tree From Descriptions?

Phantom Code adapts in real-time. Screenshot the modified problem or use audio mode to capture the interviewer's follow-up, and get an updated solution within seconds — including edge cases and optimizations.

Can Phantom Code help me communicate my solution for problems like Create Binary Tree From Descriptions?

Yes. Phantom Code provides step-by-step approach explanations with 3 progressive thoughts, so you can walk through your solution naturally. It also provides time and space complexity analysis to discuss trade-offs.

How does Phantom Code assist with different programming languages for Create Binary Tree From Descriptions type problems?

Phantom Code supports 11 programming languages including Python, Java, C++, JavaScript, TypeScript, Go, Rust, Ruby, Swift, Kotlin, and C#. Set your preferred language and get idiomatic solutions.

What coding mistakes does Phantom Code help me avoid during Create Binary Tree From Descriptions 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.

Is Phantom Code detectable when solving problems like Create Binary Tree From Descriptions during live interviews?

No. Phantom Code runs as an invisible desktop overlay that doesn't appear in screen shares, recordings, or proctoring software. It works with Zoom, HackerRank, CodeSignal, CoderPad, and all major platforms.

How does Phantom Code help when I'm struggling with Create Binary Tree From Descriptions style questions under pressure?

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 Create Binary Tree From Descriptions interviews?

Yes. Phantom Code works with all major coding platforms including LeetCode, HackerRank, CodeSignal, CoderPad, HackerEarth, and any browser-based coding environment.

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