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| /* | |
| https://www.hackerrank.com/challenges/sherlock-and-anagrams/problem | |
| */ | |
| def subs(str: String): List[String] = str.inits.flatMap(_.tails.toList.init.map(_.sorted)).toList | |
| subs(str).groupBy(identity).map(x => x._2.size).map(x => (x-1)*x/2).sum |
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