对链表的一些处理，包括头插法建表，尾插法建表，链表长度运算 ，求链表第i个元素运算 ，按值查找运算，插入结点运算，删除结点运算，逆置链表运算-On the list of some of the processing, including construction of the first interpolation table, end table built interpolation, computing the length of the list, find the i-th elem