Created
January 10, 2012 12:30
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Scala標準バージョンとScalazバージョン
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| val ACGT = "ACGT".to[Stream] | |
| @annotation.tailrec | |
| def solve0(n: Int, ss: Stream[List[Char]]): Stream[List[Char]] = | |
| if (n == 0) ss | |
| else solve0(n - 1, ACGT.flatMap(c => ss.map(c :: _))) | |
| def solve(n: Int): Stream[String] = | |
| solve0(n, Stream(Nil)) collect { | |
| case cs if cs.containsSlice("AAG") => cs.mkString | |
| } |
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| import scalaz._, Scalaz._ | |
| val ACGT = "ACGT".to[Stream] | |
| def solve(n: Int): Stream[String] = | |
| ACGT.replicateM(n) collect { | |
| case cs if cs.containsSlice("AAG") => cs.mkString | |
| } |
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| scala> solve(5) foreach println | |
| AAAAG | |
| AAAGA | |
| AAAGC | |
| AAAGG | |
| AAAGT | |
| AAGAA | |
| AAGAC | |
| AAGAG | |
| AAGAT | |
| AAGCA | |
| AAGCC | |
| AAGCG | |
| AAGCT | |
| AAGGA | |
| AAGGC | |
| AAGGG | |
| AAGGT | |
| AAGTA | |
| AAGTC | |
| AAGTG | |
| AAGTT | |
| ACAAG | |
| AGAAG | |
| ATAAG | |
| CAAAG | |
| CAAGA | |
| CAAGC | |
| CAAGG | |
| CAAGT | |
| CCAAG | |
| CGAAG | |
| CTAAG | |
| GAAAG | |
| GAAGA | |
| GAAGC | |
| GAAGG | |
| GAAGT | |
| GCAAG | |
| GGAAG | |
| GTAAG | |
| TAAAG | |
| TAAGA | |
| TAAGC | |
| TAAGG | |
| TAAGT | |
| TCAAG | |
| TGAAG | |
| TTAAG |
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