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How to Solve Most Frequent Subtree Sum Problem
Master the Most Frequent Subtree Sum LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsMedium#508
LeetCode ProblemMost Frequent Subtree Sum
Given the root of a binary tree, return the most frequent subtree sum. If there is a tie, return all the values with the highest frequency in any order. The subtree sum of a node is defined as the sum of all the node values formed by the subtree rooted at that node (including the node itself).
Hash TableTreeDepth-First SearchBinary Tree
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Problem Breakdown
Understanding the Most Frequent Subtree Sum Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
Given the root of a binary tree, return the most frequent subtree sum. If there is a tie, return all the values with the highest frequency in any order. The subtree sum of a node is defined as the sum of all the node values formed by the subtree rooted at that node (including the node itself).
MediumProblem #508
LeetCodeMost Frequent Subtree Sum
Related Topics
Hash TableTreeDepth-First SearchBinary Tree
How Phantom Code Helps
Get real-time assistance for Most Frequent Subtree Sum problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
root = [5,2,-3]
Output
[2,-3,4]
# Example 2
Input
root = [5,2,-5]
Output
[2]
Constraints
The number of nodes in the tree is in the range [1, 104].
-105 <= Node.val <= 105
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Solve Most Frequent Subtree Sum — Given the root of a binary tree, return the most frequent subtree sum. If there ...
Here's the optimal approach using Hash Table:
def solve(input):
# Optimal O(n) solution
return result
Time: O(n) | Space: O(n)
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Frequently Asked Questions
Common questions about solving Most Frequent Subtree Sum and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Most Frequent Subtree Sum 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 Most Frequent Subtree Sum?
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 Most Frequent Subtree Sum?
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 Most Frequent Subtree Sum 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 Most Frequent Subtree Sum 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 Most Frequent Subtree Sum 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 Most Frequent Subtree Sum 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 Most Frequent Subtree Sum 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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