LintCode 671 循环单词

The words are same rotate words if rotate the word to the right by loop, and get another. Count how many different rotate word sets in dictionary.

E.g. picture and turepic are same rotate words.

["picture", "turepic", "icturep", "word", "ordw", "lint"]return 3.

“picture”, “turepic”, “icturep” are same ratote words.
“word”, “ordw” are same too.
“lint” is the third word that different from the previous two words.
将每个String的变化串加进Set集合中，进行重复判断。
解一：

//671循环单词    public static int countRotateWords(List<String> words){        int count=0;        Set<String> set=new HashSet<String>();            for (int i = 0; i < words.size(); i++) {                String string=words.get(i);                if (!set.contains(string)) {                    count++;                    set.add(string);                    String b=change(string);                    while(!b.equals(string)){                        set.add(b);                        b=change(b);                    }                }            }        return count;    }    public static String change(String string){        String aString=string.substring(string.length()-1)        +string.substring(0,string.length()-1);        return aString;    }