遍历的效率都比普通链表高） hashtable.h：　　哈希表（使用键值标识元素，键值一样的元素即认为相等，需重载好(The efficiency of ergodicity is higher than the common chain table) hashtable.h: hash table (using key values to identify elements, the elements of the same key are considered equal and need to be overloaded.)