code: public LinkedList<Entry<String, V>> commonPrefixSearchWithValue(char[] key, int begin)
      {
          LinkedList<Entry<String, Integer>> valueIndex = mdag.commonPrefixSearchWithValueIndex(key, begin);
          LinkedList<Entry<String, V>> entryList = new LinkedList<Entry<String, V>>();
          for (Entry<String, Integer> entry : valueIndex)
          {
              entryList.add(new SimpleEntry<String, V>(entry.getKey(), valueList.get(entry.getValue())));
          }
  
          return entryList;
      }
docs: 前缀查询
  @param key
  @param begin
  @return