Solution: Find the K-Sum of an Array

Understand how to find the k-th largest subsequence sum in an array by transforming the problem into finding the smallest losses. Learn to use sorting and a min heap to efficiently explore subsequence sums, improving beyond brute-force methods. This lesson develops skills to solve top K element problems with optimized time and space complexity.

We'll cover the following...

Statement
Solution
- Time complexity
- Space complexity

Statement

You are given an integer array, nums, and a positive integer k. Your task is to determine and return the $k^{th}$ 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 $0$ .
Duplicate subsequence sums are allowed and counted separately when determining the $k^{th}$ largest.

Constraints:

$n ==$ nums.length
$1 \leq$ n ...