804. Unique Morse Code Words

QUESTION:

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 "--...--.".

Note:

  • The length of words will be at most 100.
  • Each words[i] will have length in range [1, 12].
  • words[i] will only consist of lowercase letters.

EXPLANATION:

这就很简单：

1.拿出每个字符串stringa

2.拿出stringa的每个字符

3.对应到摩斯码

4.组合在一起

5.添加到hashset去重

6.返回结果的size

SOLUTION:

class Solution {
    static String[] morses = new String[]{".-","-...","-.-.","-..",".","..-.","--.","....","..",".---","-.-",".-..","--","-.","---",".--.","--.-",".-.","...","-","..-","...-",".--","-..-","-.--","--.."};

    public int uniqueMorseRepresentations(String[] words) {
        HashSet<String> result = new HashSet<>();
        for(int i = 0;i<words.length;i++){
            char[] tmp = words[i].toCharArray();
            String tmpResult = "";
            for(int j = 0;j<tmp.length;j++){
                char chartmp = tmp[j];
                int index = chartmp-'a';
                tmpResult+= morses[index];
            }
            result.add(tmpResult);
        }
        return result.size();
    }
}
--> return <--