2420. Find All Good Indices

You are given a 0-indexed integer array nums of size n and a positive integer k. We call an index i in the range k <= i < n - k good if the following conditions are satisfied: - The k elements that are just before the index i are in non-increasing order. - The k elements that are just after the index i are in non-decreasing order. Return an array of all good indices sorted in increasing order.