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Sep 18th, 2014
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  1. import java.util.*;
  2.  
  3. public class Main {
  4. public static int laske(int n, char vanha) {
  5. if (n == 0) return 1;
  6. String merkit = "ACGT";
  7. int tulos = 0;
  8. for (int i = 0; i < merkit.length(); i++) {
  9. char uusi = merkit.charAt(i);
  10. if (uusi == vanha) continue;
  11. tulos += laske(n-1, uusi);
  12. }
  13. return tulos;
  14. }
  15. public static int ketjumaara(int n) {
  16. return laske(n, 'X');
  17. }
  18.  
  19. public static void main(String[] args) {
  20. System.out.println(ketjumaara(3));
  21. System.out.println(ketjumaara(1));
  22. System.out.println(ketjumaara(2));
  23. System.out.println(ketjumaara(5));
  24. }
  25. }
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