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Grokking the Coding Interview Patterns in C++

Find the K-Sum of an Array

Explore how to determine the kth largest sum among all subsequences of an integer array. Understand subsequence definitions, valid sums including duplicates, and apply efficient techniques for identifying top subsequence sums to solve this problem.

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Statement

You are given an integer array, nums, and a positive integer k. Your task is to determine and return the kthk^{th} largest possible sum among all subsequences of the array. A subsequence is formed by deleting no or more elements from the array without changing the order of the remaining elements. The sum of a subsequence is the total of its elements.

Remember: For valid subsequences:

  • The empty subsequence is valid, and its sum is considered 00.

  • Duplicate subsequence sums are ...