SenseOfSecurity.java

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package senseofsecuritz;
 
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.HashMap;
 
/**
 *
 * @author istenik3
 */
public class SenseOfSecurity {
    static private HashMap<String, Character> fromMorse = new HashMap<String, Character>();
    static private HashMap<Character, String> toMorse = new HashMap<Character, String>();
 
    static public void map(Character c, String s) {
        fromMorse.put(s, c);
        toMorse.put(c, s);
    }
 
    public static void main(String[] args) throws Exception {
        map('A', ".-");
        map('B', "-...");
        map('C', "-.-.");
        map('D', "-..");
        map('E', ".");
        map('F', "..-.");
        map('G', "--.");
        map('H', "....");
        map('I', "..");
        map('J', ".---");
        map('K', "-.-");
        map('L', ".-..");
        map('M', "--");
        map('N', "-.");
        map('O', "---");
        map('P', ".--.");
        map('Q', "--.-");
        map('R', ".-.");
        map('S', "...");
        map('T', "-");
        map('U', "..-");
        map('V', "...-");
        map('W', ".--");
        map('X', "-..-");
        map('Y', "-.--");
        map('Z', "--..");
        map('_', "..--");
        map(',', ".-.-");
        map('.', "---.");
        map('?', "----");
 
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
 
        String line = null;
        while((line = reader.readLine()) != null) {
            StringBuilder morse = new StringBuilder();
            StringBuilder integers = new StringBuilder();
 
            for(char c : line.toCharArray()) {
                morse.append(toMorse.get(c));
                integers.append(toMorse.get(c).length());
            }
 
            int offset = 0;
            for(int i=integers.length()-1; i>=0; i--) {
                int l = Integer.parseInt(""+integers.charAt(i));
                String m = morse.substring(offset, offset+l);
                offset += l;
 
                System.out.print(fromMorse.get(m));
            }
 
            System.out.println();
        }
    }
}