27 lines
731 B
Scala
27 lines
731 B
Scala
//> using dep org.scala-lang.modules::scala-parser-combinators::2.3.0
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package aoc
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import scala.util.parsing.combinator._
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def iterate[T](get: => T | Null) =
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Iterator.continually(get).takeWhile(_ != null).map(_.nn)
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def lines = iterate(scala.io.StdIn.readLine())
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class CommonParser extends RegexParsers:
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val num = """-?(0|[1-9]\d*)""".r ^^ { _.toInt }
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val long = """-?(0|[1-9]\d*)""".r ^^ { _.toLong }
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object CommonParser extends CommonParser
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extension [T](ss: Seq[T])
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@scala.annotation.tailrec
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def findMap[U](f: T => Option[U]): Option[U] =
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if ss.isEmpty then None
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else
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val (head, tail) = (ss.head, ss.tail)
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f(head) match
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case None => tail.findMap(f)
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case v @ Some(_) => v
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