code: public int build(TreeMap<String, V> keyValueMap)
      {
          assert keyValueMap != null;
          Set<Map.Entry<String, V>> entrySet = keyValueMap.entrySet();
          return build(entrySet);
      }
docs: 方便地构造一个双数组trie树
  
  @param keyValueMap 升序键值对map
  @return 构造结果