Question: / / Inserts a hashtag ( tweeted 0 times ) into the Trendtracker. / / If the hashtag already is in Trendtracker, does nothing. /

// Inserts a hashtag (tweeted 0 times) into the Trendtracker.
// If the hashtag already is in Trendtracker, does nothing.
//
// Must run in O(n) time.

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