查找序列以带头结点的单链表表示，各结点中设一个访问频度，初始值为 0，每次查找成功后该结点频度值增加 1。试给出算法，在每次查找后查找序列均按访问频度从大到小排列。 -Find a sequence of nodes in order to take the lead in a single list that each node in a visit to the frequency, the initial value of 0, after the success of each to