How to Solve Kth Largest Sum in a Binary Tree Problem
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Kth Largest Sum in a Binary Tree
You are given the root of a binary tree and a positive integer k. The level sum in the tree is the sum of the values of the nodes that are on the same level. Return the kth largest level sum in the tr...
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Understanding the Kth Largest Sum in a Binary Tree Problem
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Problem Statement
You are given the root of a binary tree and a positive integer k. The level sum in the tree is the sum of the values of the nodes that are on the same level. Return the kth largest level sum in the tree (not necessarily distinct). If there are fewer than k levels in the tree, return -1. Note that two nodes are on the same level if they have the same distance from the root.
Kth Largest Sum in a Binary Tree
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Examples
root = [5,8,9,2,1,3,7,4,6], k = 213The level sums are the following: - Level 1: 5. - Level 2: 8 + 9 = 17. - Level 3: 2 + 1 + 3 + 7 = 13. - Level 4: 4 + 6 = 10. The 2nd largest level sum is 13.
root = [1,2,null,3], k = 13The largest level sum is 3.
Constraints
The number of nodes in the tree is n.2 <= n <= 1051 <= Node.val <= 1061 <= k <= nHow Interview Coder Helps with Leetcode Problems
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