定义单链表类、链式栈类、顺序队列类。
2、 实验验证如下算法的正确性、各种功能及指标：
1）单链表插入操作：在第 i 个元素之后插入值为 x 的结点；
2）单链表删除操作：删除表头结点、表尾结点；
3）查找操作：查找值为 x 的元素在单链表中出现的位置（是链表中的第几个元素）；
4）压栈和弹栈操作；
5）出队和入队操作。(Define single chain table class, chain stack class, sequence queue class.
2. The experiment verifies the correctness of the following algorithms, various functions and indicators.
1) single chain table insert operation: after the I element, insert a node with a value of X;
2) single chain table delete operation: delete the header node, the table tail node;
3) lookup operation: find the location of the element of X in the single chain table (a number of elements in the list);
4) pressure stack and missile stack operation;
5) out of the team and operation team.)