Created
September 26, 2016 06:28
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`withFilter` rocks when used as a flag & something like short circulating
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| def anyDuplicate(arr: List[Int], k: Int): Boolean = { | |
| var any_duplicate = false | |
| val hs = mutable.HashSet[(Int, Int)]() | |
| arr.zipWithIndex | |
| .withFilter(_ => !any_duplicate) | |
| .map { | |
| case tp @ (e, idx) => | |
| hs.find(_._1 == tp._1) match { | |
| case Some((d, idxD)) if (tp._2 - idxD <= k) => | |
| any_duplicate = true // <-------- update flag | |
| case Some(_) => () | |
| case None => | |
| hs.add(tp) | |
| } | |
| } | |
| any_duplicate | |
| } |
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