3026. Maximum Good Subarray Sum

You are given an array nums of length n and a positive integer k. A subarray of nums is called good if the absolute difference between its first and last element is exactly k, in other words, the subarray nums[i..j] is good if |nums[i] - nums[j]| == k. Return the maximum sum of a good subarray of nums. If there are no good subarrays, return 0. Example 1: Input: nums = [1,2,3,4,5,6], k = 1 Ou