3679. Minimum Discards to Balance Inventory

You are given two integers w and m, and an integer array arrivals, where arrivals[i] is the type of item arriving on day i (days are 1-indexed). Items are managed according to the following rules: - Each arrival may be kept or discarded; an item may only be discarded on its arrival day. - For each day i, consider the window of days [max(1, i - w + 1), i] (the w most recent days up to day i): -