Method scramble

app/src/main/java/solver/EightPuzzle.java:84–100

(Random r)

    }

    public static String scramble(Random r) {
        init();
        int n;
        do {
            n = r.nextInt(362880);
        } while (prun[n] < 4);
        for (int d = 0; d < 24; d++) {
            if (search(n, d)) {
                StringBuilder sb = new StringBuilder();
                for (int i = 1; i <= d; i++) {
                    sb.append("UDLR".charAt(seq[i] >> 1)).append(suff[seq[i] & 1]);
                }
                return sb.toString();
            }
        }
        return "error";
    }

    public static int[] image(String scramble) {
        for (int i = 0; i < 9; i++) pz[i] = i;