算法当向该树插入一个元素时，若树中已存在该元素的关键码相同的结点，则该结点的count域加1；否则生成新的结点，并置该结点的count域为1-Algorithm when inserting an element to the tree, if the tree already exists the elements of the key code to the same node, then the node count domain plus 1 otherwise it produces