Leetcode 3092. Most Frequent IDs

Given a sequence of ID updates where each step adds or removes a given number of copies of an ID, maintain the dynamic multiset of ID counts and return the current maximum count (or 0 if empty) after each step. The challenge is to efficiently track per-ID frequencies and support fast queries for the highest frequency across up to 1e5 updates.

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Leetcode 3092. Most Frequent IDs

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