The List ADT

1、Definiation

A list is a sequence.  a0, a1,a2,..., aN (N>0)

2、Character

For any list except the empty list, we say that Ai follows(or succeeds)Ai-1(i<N) and that Ai-1 precedes Ai(i>0).

3、Operations

(1) LenList(L);            // 返回表的长度
(2) GetElem(i, e);       // 换值
(3) SearchElem(e, i); // 按值查找
(4) InertElem(i, e); // 插值
(5) DeleteElem(i);   // 删值

(1)LenList(L);

LenList(L)
   output: 整数类型;
   Post-condition: 输出表的长度;

(2) GetElem(L, i);

GetElem(i, e)
    Input: 位置参数;
    output: e;
    Pre-condition: 0<=i<LenList(L);
    Post-condition: e被赋予在list的第i个位置;

(3) SearchElem(L, e)

SearchElem(e, i)
     intput: e;
     output: 位置参数i;
     Pre-condition: i<LenList(L);
     Post-condition: if e 存在于表中，则输出位置参数，否则输出为0; 

(4)InsertElem(i, e)

InsertElem(i, e)
   input: 位置i, e;
   Pre-condition: 0<=i<LenList(L);
   Pos-condition: 在i 的位置插入e;

(5)DeleteElem(i)

DeleteElem(i)
    input: 位置参数i;
    Pre-condition: 0<=i<LenList(L);
    Pos-condition: 删除位置i上的元素;