Java
import java.util.HashSet;
import java.util.Set;
/**
International Morse Code defines a standard encoding where each letter is mapped to a series of dots and dashes, as follows: "a" maps to ".-", "b" maps to "-...", "c" maps to "-.-.", and so on.
For convenience, the full table for the 26 letters of the English alphabet is given below:
[".-","-...","-.-.","-..",".","..-.","--.","....","..",".---","-.-",".-..","--","-.","---",".--.","--.-",".-.","...","-","..-","...-",".--","-..-","-.--","--.."]
Now, given a list of words, each word can be written as a concatenation of the Morse code of each letter. For example, "cab" can be written as "-.-.-....-", (which is the concatenation "-.-." + "-..." + ".-"). We'll call such a concatenation, the transformation of a word.
Return the number of different transformations among all words we have.
Example:
Input: words = ["gin", "zen", "gig", "msg"]
Output: 2
Explanation:
The transformation of each word is:
"gin" -> "--...-."
"zen" -> "--...-."
"gig" -> "--...--."
"msg" -> "--...--."
There are 2 different transformations, "--...-." and "--...--.".
*/
public class Unique_Morse_Code_Words {
class Solution {
public int uniqueMorseRepresentations(String[] words) {
String[] MORSE = new String[]{
".-","-...","-.-.","-..",".","..-.","--.",
"....","..",".---","-.-",".-..","--","-.",
"---",".--.","--.-",".-.","...","-","..-",
"...-",".--","-..-","-.--","--.."};
Set<String> seen = new HashSet<>();
for (String word: words) {
StringBuilder code = new StringBuilder();
for (char c: word.toCharArray())
code.append(MORSE[c - 'a']);
seen.add(code.toString());
}
return seen.size();
}
}
}Java
class Solution {
public int uniqueMorseRepresentations(String[] words) {
String[] morseArray = {".-","-...","-.-.","-..",".","..-.","--.","....","..",".---","-.-",".-..","--","-.","---",".--.","--.-",".-.","...","-","..-","...-",".--","-..-","-.--","--.."};
Set<String> set = new HashSet<String>();
for (String word : words) {
StringBuffer sb = new StringBuffer();
char[] array = word.toCharArray();
for (char c : array)
sb.append(morseArray[c - 'a']);
set.add(sb.toString());
}
return set.size();
}
}