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- import java.util.*;
- public class Main {
- public static int laske(int n, char vanha) {
- if (n == 0) return 1;
- String merkit = "ACGT";
- int tulos = 0;
- for (int i = 0; i < merkit.length(); i++) {
- char uusi = merkit.charAt(i);
- if (uusi == vanha) continue;
- tulos += laske(n-1, uusi);
- }
- return tulos;
- }
- public static int ketjumaara(int n) {
- return laske(n, 'X');
- }
- public static void main(String[] args) {
- System.out.println(ketjumaara(3));
- System.out.println(ketjumaara(1));
- System.out.println(ketjumaara(2));
- System.out.println(ketjumaara(5));
- }
- }
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