说明：  初始化顺序表L；依次采插入a,b,c,d,e元素；输出顺序表L；输出顺序表L长度；判断顺序表L是否为空；输出顺序表L的第三个元素；输出元素’a’的位置；在第四元素位置上插入’f’元素；输出顺序表L； 删除顺序表L的第三个元素；输出顺序表L；
(The initialization sequence table L followed by mining into the A, B, C, D, e elements the output sequence table L the output sequence table L length determine the sequence table L is empty the output sequence table L third elements the output element a position in the fourth element position of insert f the output sequence table L elements Remove the sequence table L third elements the output sequence table L )