@Override
        public int compareTo(CharCount cc) {
            if(this.count >= cc.count){
                return -1;
            }else{
                return 1;
            }
        }
http://www.geeksforgeeks.org/rearrange-a-string-so-that-all-same-characters-become-at-least-d-distance-away/
src/com/interview/string/RearrangeDuplicateCharsdDistanceAway.java