/**
     * Given an array of strings, return all groups of strings that are anagrams.
        Note: All inputs will be in lower-case.
     * @param strs
     * @return
     */
    public ArrayList<String> anagrams(String[] strs) {
        ArrayList<String> list = new ArrayList<String>();
        HashMap<String,ArrayList<String>> map = new HashMap<String,ArrayList<String>>();
        for(int i = 0; i<strs.length; i++){
            if(map.get(sortStr(strs[i]))==null){
                ArrayList<String> item = new ArrayList<String>();
                item.add(strs[i]);
                map.put(sortStr(strs[i]),item);
            }
            else{
                map.get(sortStr(strs[i])).add(strs[i]);
            }
        }
        for(Map.Entry<String,ArrayList<String>> entry:map.entrySet()){
            if(entry.getValue().size()>1){
                for(String str:entry.getValue()){
                    list.add(str);
                }
            }
        }
        return list;
    }

    public String sortStr(String str){
        char[] sortedArray = str.toCharArray();
        Arrays.sort(sortedArray);
        return new String(sortedArray);
    }