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How to Solve Number of Good Leaf Nodes Pairs Problem
Master the Number of Good Leaf Nodes Pairs LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsMedium#1530
LeetCode ProblemNumber of Good Leaf Nodes Pairs
You are given the root of a binary tree and an integer distance. A pair of two different leaf nodes of a binary tree is said to be good if the length of the shortest path between them is less than or equal to distance. Return the number of good leaf node pairs in the tree.
TreeDepth-First SearchBinary Tree
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Problem Breakdown
Understanding the Number of Good Leaf Nodes Pairs Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
You are given the root of a binary tree and an integer distance. A pair of two different leaf nodes of a binary tree is said to be good if the length of the shortest path between them is less than or equal to distance. Return the number of good leaf node pairs in the tree.
MediumProblem #1530
LeetCodeNumber of Good Leaf Nodes Pairs
Related Topics
TreeDepth-First SearchBinary Tree
How Phantom Code Helps
Get real-time assistance for Number of Good Leaf Nodes Pairs problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
root = [1,2,3,null,4], distance = 3
Output
1
# Example 2
Input
root = [1,2,3,4,5,6,7], distance = 3
Output
2
# Example 3
Input
root = [7,1,4,6,null,5,3,null,null,null,null,null,2], distance = 3
Output
1
Constraints
The number of nodes in the tree is in the range [1, 210].
1 <= Node.val <= 100
1 <= distance <= 10
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Solve Number of Good Leaf Nodes Pairs — You are given the root of a binary tree and an integer distance. A pair of two d...
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def solve(input):
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Frequently Asked Questions
Common questions about solving Number of Good Leaf Nodes Pairs and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Number of Good Leaf Nodes Pairs 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 Number of Good Leaf Nodes Pairs?
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 Number of Good Leaf Nodes Pairs?
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 Number of Good Leaf Nodes Pairs 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 Number of Good Leaf Nodes Pairs 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 Number of Good Leaf Nodes Pairs 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 Number of Good Leaf Nodes Pairs 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 Number of Good Leaf Nodes Pairs 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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