How to Solve Number of Good Leaf Nodes Pairs Problem
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Number 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 ...
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Understanding the Number of Good Leaf Nodes Pairs Problem
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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.
Number of Good Leaf Nodes Pairs
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Examples
root = [1,2,3,null,4], distance = 31The leaf nodes of the tree are 3 and 4 and the length of the shortest path between them is 3. This is the only good pair.
root = [1,2,3,4,5,6,7], distance = 32The good pairs are [4,5] and [6,7] with shortest path = 2. The pair [4,6] is not good because the length of ther shortest path between them is 4.
root = [7,1,4,6,null,5,3,null,null,null,null,null,2], distance = 31The only good pair is [2,5].
Constraints
The number of nodes in the tree is in the range [1, 210].1 <= Node.val <= 1001 <= distance <= 10How Interview Coder Helps with Leetcode Problems
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