No copy-past and compilation, please! Try to understand, what this Java code does just reading it. Be honest with yourself, cheaters die along :)
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| // Java program to print *** | |
| public class Secret | |
| { | |
| public static void main(String[] args) | |
| { | |
| String str = "ABC"; | |
| int n = str.length(); | |
| Secret secret = new Secret(); | |
| secret.doYourDance(str, 0, n-1); | |
| } | |
| /** | |
| * *** function | |
| * @param str string to *** | |
| * @param l starting index | |
| * @param r end index | |
| */ | |
| private void doYourDance(String str, int l, int r) | |
| { | |
| if (l == r) | |
| System.out.println(str); | |
| else | |
| { | |
| for (int i = l; i <= r; i++) | |
| { | |
| str = swap(str,l,i); | |
| doYourDance(str, l+1, r); | |
| str = swap(str,l,i); | |
| } | |
| } | |
| } | |
| /** | |
| * Swap Characters at position | |
| * @param a string value | |
| * @param i position 1 | |
| * @param j position 2 | |
| * @return swapped string | |
| */ | |
| public String swap(String a, int i, int j) | |
| { | |
| char temp; | |
| char[] charArray = a.toCharArray(); | |
| temp = charArray[i] ; | |
| charArray[i] = charArray[j]; | |
| charArray[j] = temp; | |
| return String.valueOf(charArray); | |
| } | |
| } |
Got it? was is hard, smart a**s? :) Stay tuned for more puzzles!
