Fs.java

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//package fo;
 
import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;
 
/**
 *
 * @author cteam017
 */
public class Fs {
 
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        ArrayList<Integer> lengths = new ArrayList<Integer>();
 
        while (sc.hasNext()) {
        String line = sc.next();
 
 
        String morsedText = "";
        for (int i = 0; i < line.length(); i++) {
            String morsedChar = toMorse(line.charAt(i));
            int morsedLen = morsedChar.length();
 
            lengths.add(morsedLen);
            morsedText += morsedChar;
//            System.out.println(line.charAt(i) + " -> " + morsedChar + "  " + morsedLen);
        }
 
        String lenStrs = "";
        for (Integer i : lengths){
            lenStrs+=i;
        }
//        System.out.println("Coded into: "+morsedText + " " + lenStrs);
 
        Collections.reverse(lengths);
        String res = decodeMorse(morsedText, lengths);
 
        System.out.println(res);
        lengths.clear();
        }
    }
 
    static String decodeMorse(String in, ArrayList<Integer> lengths) {
//        System.out.println("\n\n\n\nDECODE MORSE: "+in);
        int pos = 0;
        String res = "";
 
        for (int i = 0; i < lengths.size(); i++) {
//            System.out.println("new char, its len=" + lengths.get(i));
            String newChar = "";
            for (int k = 0; k < lengths.get(i); k++) {
//                System.out.println("  NewChar += " + in.charAt(pos) + "  pos="+pos);
                newChar += in.charAt(pos++);
            }
//            System.out.println("  char completed: "+newChar);
            res+=fromMorse(newChar);
//            System.out.println("-- res so far: "+res);
        }
 
        return res;
    }
 
    static char fromMorse(String in) {
        if (in.equals(".-")) {
            return 'A';
        }
        if (in.equals("-...")) {
            return 'B';
        }
        if (in.equals("-.-.")) {
            return 'C';
        }
        if (in.equals("-..")) {
            return 'D';
        }
        if (in.equals(".")) {
            return 'E';
        }
        if (in.equals("..-.")) {
            return 'F';
        }
        if (in.equals("--.")) {
            return 'G';
        }
        if (in.equals("....")) {
            return 'H';
        }
        if (in.equals("..")) {
            return 'I';
        }
        if (in.equals(".---")) {
            return 'J';
        }
        if (in.equals("-.-")) {
            return 'K';
        }
        if (in.equals(".-..")) {
            return 'L';
        }
        if (in.equals("--")) {
            return 'M';
        }
        if (in.equals("-.")) {
            return 'N';
        }
        if (in.equals("---")) {
            return 'O';
        }
        if (in.equals(".--.")) {
            return 'P';
        }
        if (in.equals("--.-")) {
            return 'Q';
        }
        if (in.equals(".-.")) {
            return 'R';
        }
        if (in.equals("...")) {
            return 'S';
        }
        if (in.equals("-")) {
            return 'T';
        }
        if (in.equals("..-")) {
            return 'U';
        }
        if (in.equals("...-")) {
            return 'V';
        }
        if (in.equals(".--")) {
            return 'W';
        }
        if (in.equals("-..-")) {
            return 'X';
        }
        if (in.equals("-.--")) {
            return 'Y';
        }
        if (in.equals("--..")) {
            return 'Z';
        }
 
        if (in.equals("..--")) {
            return '_';
        }
 
        if (in.equals(".-.-")) {
            return ',';
        }
 
        if (in.equals("---.")) {
            return '.';
        }
 
        if (in.equals("----")) {
            return '?';
        }
 
 
        return '*';
 
    }
 
    static String toMorse(char letter) {
        switch (letter) {
            case 'A':
                return ".-";
            case 'B':
                return "-...";
            case 'C':
                return "-.-.";
            case 'D':
                return "-..";
            case 'E':
                return ".";
            case 'F':
                return "..-.";
            case 'G':
                return "--.";
            case 'H':
                return "....";
            case 'I':
                return "..";
            case 'J':
                return ".---";
            case 'K':
                return "-.-";
            case 'L':
                return ".-..";
            case 'M':
                return "--";
            case 'N':
                return "-.";
            case 'O':
                return "---";
            case 'P':
                return ".--.";
            case 'Q':
                return "--.-";
            case 'R':
                return ".-.";
            case 'S':
                return "...";
            case 'T':
                return "-";
            case 'U':
                return "..-";
            case 'V':
                return "...-";
            case 'W':
                return ".--";
            case 'X':
                return "-..-";
            case 'Y':
                return "-.--";
            case 'Z':
                return "--..";
 
            case '_':
                return "..--";
            case ',':
                return ".-.-";
            case '.':
                return "---.";
            case '?':
                return "----";
        }
        return "";
    }
}