rirakkumya’s gists

rirakkumya / Int_String.scala

Created April 6, 2012 11:58

	scala> object scala {type Int = String}
	scala> val dd:scala.Int = 33
	<console>:11: error: type mismatch;
	found : scala.Int(33)
	required: scala.Int
	val dd:scala.Int = 33
	^

rirakkumya / build.sbt

Created March 22, 2012 11:29

漢数字変換 by scala parser combinator

libraryDependencies += "org.scala-tools.testing" %% "scalacheck" % "1.9"

rirakkumya / strProblem.scala

Created March 18, 2012 15:00

最長重複文字列問題

	def maxDupStr(str:String) = {
	def tails:String => List[String] = {
	case "" => Nil
	case x => x :: tails(x.tail)
	}
	val sorted = tails(str) sorted
	val pair = sorted zip sorted.tail
	val maxPair = {
	pair map { case (s1,s2) => (s1 zip s2 filter {c => c._1 == c._2} size, s1)} max
	}

rirakkumya / problem.scala

Created March 15, 2012 11:30

どう書けばいいのかな

	この問題を解決するには、

	scala> val f:Int => Int = x => x
	f: (Int) => Int = <function1>

	この関数に数値を代入して、同じ関数を返す事が出来ないとダメなので解決出来ない。

rirakkumya / build.sbt

Created March 2, 2012 06:25

lift-jsonの一番簡単な使い方メモ #scala

libraryDependencies += "net.liftweb" %% "lift-json" % "2.4"

rirakkumya / build.sbt

Created February 29, 2012 01:45

scala-ioとscalacheckでランダムデータを作っちゃうコード

	resolvers += "Scala Tools Snapshots" at "http://scala-tools.org/repo-snapshots/"

	libraryDependencies += "org.scalaz" %% "scalaz-core" % "6.0.4"

	libraryDependencies += "com.github.scala-incubator.io" %% "scala-io-core" % "0.3.0"

	libraryDependencies += "com.github.scala-incubator.io" %% "scala-io-file" % "0.3.0"

	libraryDependencies += "org.scala-tools.testing" %% "scalacheck" % "1.9"

rirakkumya / StormWordCount.scala

Created February 8, 2012 07:17

【twitter Storm】ScalaStormとscala-redisでword countっちゃうコード

	package storm.scala.examples

	import storm.scala.dsl._
	import backtype.storm.Config
	import backtype.storm.LocalCluster
	import backtype.storm.topology.TopologyBuilder
	import backtype.storm.tuple.{Fields, Tuple, Values}
	import com.redis._
	import collection.mutable.{Map, HashMap}
	import util.Random

rirakkumya / Build.scala

Created February 8, 2012 02:26

Scala Storm × scala redis

	import sbt._
	import Keys._

	object ScalaStromBuild extends Build {
	lazy val root = Project(id = "ScalaStorm", base = file(".")) aggregate (scalaRedis) dependsOn(scalaRedis)
	lazy val scalaRedis = Project(id = "scala-redis", base = file("scala-redis"))
	}

rirakkumya / foldLeft.scala

Created February 1, 2012 08:11

fold関数の使い方

	def hb(i1:String,i2:String) = (i1 zip i2).foldLeft((0,0)){(a, b) => if(b._1 == b._2) (a._1+1,a._2) else (a._1,a._2+1)}
	def s(n:Int) = (1 to n).foldLeft(List("")){(l,_) => List("A","C","G","T").flatMap(x => l.map(_ + x))}.filter(_.contains("AAG"))

rirakkumya / primeDec.scala

Created February 1, 2012 06:47

素因数分解

	//scalaっぽい素因数分解
	import scala.annotation.tailrec

	object PrimeTest extends App {
	def primeDec(n: Int) = {
	@tailrec
	def r(in: Int, plist: List[Int], result: List[Int] = List()): List[Int] = {
	plist match {
	case x :: xs if in % x == 0 => r(in / x, plist, x :: result)
	case x :: xs if in % x != 0 => r(in, xs, result)

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