Leetcode 3375. Minimum Operations to Make Array Values Equal to K

Given an array and a target k, you may repeatedly pick a valid h (all elements > h must be identical) and set those elements to h; compute the minimum operations to make every element equal to k, or return -1 if impossible. The core challenge is that values only decrease, so feasibility requires no element < k, and the minimal number of operations corresponds to the number of distinct values strictly greater than k.