Unique Substrings Query

This is a companion discussion topic for the original entry at https://toph.co/p/unique-substrings-query

Please, update the problem statement.

query part is missing in problem statement. please fix it @hjr265

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Looks like the original equation was an image that had expired at the source. It took a bit to figure out what the equation was. The problem statement has been updated. Thanks for reporting! @rkb_rd

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