Find Top Hashtags

You are given two arrays of length `n`: - `tweets[i]`: the content of the `i`-th tweet as a string - `timestamps[i]`: the publish time of the `i`-th tweet as an integer You are also given two integers: - `currentTime` - `timeWindow` Consider only tweets whose timestamp falls within the inclusive time interval: `[currentTime - timeWindow, currentTime]` A hashtag is any token in a tweet that starts with `#`. Count hashtag popularity by the number of times each hashtag appears in the tweets within the time window. Return the most popular at most 3 hashtags. Sort hashtags by descending count. If two hashtags have the same count, sort them lexicographically ascending. If fewer than 3 hashtags appear in the time window, return all of them.