import java.util.Scanner; import java.util.NoSuchElementException; public class CryptoCube { public static void main(String[] args) { Scanner sc = new Scanner(System.in); //Enter the text to be encrypted or decrypted String text, type, sequence; try { text = sc.nextLine(); if (text.trim().equals("")) throw new NoSuchElementException(); } catch (NoSuchElementException e) { text = "Sololearn is awesome"; } System.out.println(text); //Enter "encrtypt" for encryption or "decrypt" for decryption try { type = sc.nextLine() .toLowerCase(); } catch (NoSuchElementException e) { type = "encrypt"; } boolean encrypt = false; if (type.startsWith("e")) encrypt = true; System.out .println (encrypt ? "Encrypting....." : "Decrypting...."); //Enter the encryption/decryprtion sequence e.g 0:U:U,1:R:U,2:D try { sequence = sc.nextLine() .toUpperCase().replaceAll("\\s+",""); } catch (NoSuchElementException e) { sequence = "0:D:R,1:L:U,2:L"; } System.out.println("Encryption/Decryption Sequence: " + sequence); EncryptDecrypt e = new EncryptDecrypt(text); String res = e .encryptDecrypt(sequence, encrypt); if (encrypt) System.out.println("Encrypted text is: " + res); else { int end = res.length(); while (res.charAt(end - 1) == '$') end--; System.out.println("Decrypted text is: " + res.substring(0, end)); } System.out.println("\nKudos to Sololearn for this most challenging competition!"); } } class EncryptDecrypt { private String text; public EncryptDecrypt(String text) { this.text = text; System.out.println("\nDollar($) characters present in encrypted and / or decrypted text are a necessary evil for this code to run smoothly. They must be included for proper decryption but won't appear in the decrypted text\n"); } public String encryptDecrypt (String rotationSequence, boolean encrypt) { int charCount = this.text.length(); int numOfCubes = (int)Math .ceil((double) charCount / 8); Cube[] cubes = new Cube[numOfCubes]; int i = 0; for (int j = 0;j < numOfCubes;j++) { char[] letters = new char [(charCount) - i >= 8 ? 8 : (charCount) - i]; int count = letters.length; for (int k = 0;k < count;k++) { letters[k] = this .text.charAt(i); i++; } cubes[j] = new Cube(letters, j); } String [] sequences = rotationSequence .split(","); for (int j = 0;j < sequences.length;j++) { if (j < cubes.length) cubes[j].turnCube(sequences[j], encrypt); } String encrypted = ""; for (Cube cube : cubes) encrypted += new String(cube.getChars()); return encrypted; } } class Cube { private int xPos; private int yPos; private int zPos; private boolean moveAlongY; private boolean up; private boolean right; private int charCount; private final int cubeNumber; private char[][][] cube; public Cube(char[] letters, int cubeNumber) { if (letters.length > 8) throw new IllegalArgumentException("Too many characters!"); cube = new char[2][2][2]; xPos = 0; yPos = 0; zPos = 0; moveAlongY = true; up = true; right = true; this.cubeNumber = cubeNumber; fillCube(letters); } private void fillCube(char[] letters) { charCount = letters.length; int j = 0; for (int i = 0;i < 8;i++) { if (i == 4) zPos++; if (j < charCount) { cube[xPos][yPos][zPos] = letters[j]; j++; } else cube[xPos][yPos][zPos] = '$'; if (moveAlongY) { if (up) { yPos++; up = false; } else { yPos--; up = true; } moveAlongY = false; } else { if (right) { xPos++; right = false; } else { xPos--; right = true; } moveAlongY = true; } } drawCube(); } public void rotateRight() { char[] temp = new char[2]; temp[0] = cube[1][0][0]; temp[1] = cube[1][1][0]; cube[1][0][0] = cube[0][0][0]; cube[1][1][0] = cube[0][1][0]; cube[0][0][0] = cube[0][0][1]; cube[0][1][0] = cube[0][1][1]; cube[0][0][1] = cube[1][0][1]; cube[0][1][1] = cube[1][1][1]; cube[1][0][1] = temp[0]; cube[1][1][1] = temp[1]; drawCube(); } public void rotateLeft() { char[] temp = new char[2]; temp[0] = cube[1][0][0]; temp[1] = cube[1][1][0]; cube[1][0][0] = cube[1][0][1]; cube[1][1][0] = cube[1][1][1]; cube[1][0][1] = cube[0][0][1]; cube[1][1][1] = cube[0][1][1]; cube[0][0][1] = cube[0][0][0]; cube[0][1][1] = cube[0][1][0]; cube[0][0][0] = temp[0]; cube[0][1][0] = temp[1]; drawCube(); } public void rotateUp() { char[] temp = new char[2]; temp[0] = cube[0][0][0]; temp[1] = cube[1][0][0]; cube[0][0][0] = cube[0][0][1]; cube[1][0][0] = cube[1][0][1]; cube[0][0][1] = cube[0][1][1]; cube[1][0][1] = cube[1][1][1]; cube[0][1][1] = cube[0][1][0]; cube[1][1][1] = cube[1][1][0]; cube[0][1][0] = temp[0]; cube[1][1][0] = temp[1]; drawCube(); } public void rotateDown() { char[] temp = new char[2]; temp[0] = cube[0][0][0]; temp[1] = cube[1][0][0]; cube[0][0][0] = cube[0][1][0]; cube[1][0][0] = cube[1][1][0]; cube[0][1][0] = cube[0][1][1]; cube[1][1][0] = cube[1][1][1]; cube[0][1][1] = cube[0][0][1]; cube[1][1][1] = cube[1][0][1]; cube[0][0][1] = temp[0]; cube[1][0][1] = temp[1]; drawCube(); } public void print() { for (int i=0;i

Crypto-Cube Challenge