500. Keyboard Row

啊呀窝草。。尼玛JAVA写的真是烦啊，还不如去写Python算了，人家五六行我得30行。

class Solution {
    public String[] findWords(String[] words) {
        ArrayList<String> result = new ArrayList<>();
        HashSet<Character> set1 = new HashSet<>();
        HashSet<Character> set2 = new HashSet<>();
        HashSet<Character> set3 = new HashSet<>();
        intal_rows(set1,"QWERTYUIOPqwertyuiop");
        intal_rows(set2,"ASDFGHJKLasdfghjkl");
        intal_rows(set3,"ZXCVBNMzxcvbnm");
         Sub(set1,words,result);
         Sub(set2,words,result);
         Sub(set3,words,result);
         String[] s = new String[result.size()];
          result.toArray(s);
         return s;
    }
    private void intal_rows (HashSet<Character> set,String s)
    {
        for(int i =0;i<s.length();i++)
        {
            set.add(s.charAt(i));
        }
    }
    private void Sub (HashSet<Character> set,String[] words,ArrayList<String> result)
    {
        for(String s :words)
        {
            int i =0;
            for( i = 0 ;i<s.length();i++)
            {
                if(!set.contains(s.charAt(i)))
                    break;
            }
            if(i==s.length())
              result.add(s);
        }
    }   
}