Download code

Jump to: navigation, search

Back to Look_and_say_sequence_(Scala)

Download for Windows: single file, zip

Download for UNIX: single file, zip, tar.gz, tar.bz2

LookAndSay.scala

 1 /* The authors of this work have released all rights to it and placed it
 2 in the public domain under the Creative Commons CC0 1.0 waiver
 3 (http://creativecommons.org/publicdomain/zero/1.0/).
 4 
 5 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 6 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 7 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 8 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 9 CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
10 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
11 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
12 
13 Retrieved from: http://en.literateprograms.org/Look_and_say_sequence_(Scala)?oldid=11666
14 */
15 
16 object LookAndSay {
17 
18     def lookAndSay(seed: String, length: Int): List[String] = {
19 
20           def generateNext(digits: String, prev: Char, curlen: Int): String = {
21             if (digits=="") curlen.toString + prev
22             else if (prev == digits.charAt(0)) generateNext(digits.substring(1),
23       						      prev,
24       						      (curlen + 1))
25             else curlen.toString + prev + generateNext(digits.substring(1),
26       						 digits.charAt(0),
27       						 1)
28       	
29           }
30 
31 
32       if (length == 0) Nil
33       else {
34         val next = generateNext(seed.substring(1), seed.charAt(0), 1)
35         seed :: lookAndSay(next, length-1)
36       }
37     }
38 
39 
40   def main(args: Array[String]): Unit = {
41     System.out.println(lookAndSay(args(0), Integer.parseInt(args(1))))
42   }
43 }


hijacker
hijacker
hijacker
hijacker