Leetcode 3177. Find the Maximum Length of a Good Subsequence II

Find the longest subsequence of nums that has at most k adjacent changes (i.e., at most k indices i with seq[i] != seq[i+1], equivalently at most k+1 constant runs). The core challenge is maximizing picks under a small transition budget (k ≤ 50), typically solved with dynamic programming over transition count and last chosen value or run.