第九课 — 静态链表

单链表完美解决了顺序表的问题 ！

  还有其它改进顺序表的方法吗？

牛人小C C 。 出场 。。。顺序表有优势 ， 单链表也同样有缺点

单链表的相对劣势

单链表的实现严重依赖指针 ！

 数据元素中必须包含一个额外的指针域 ！

没有指针的程序设计语言无法实现！

顺序表的改进

 静态链表的逻辑结构

静态链表相关定义

  静态链表操作

 函数实现代码如下：

#include <stdio.h>
#include <malloc.h>
#include "StaticList.h"

#define AVAILABLE -1

/* 结点结构体的定义 */
typedef struct _tag_StaticListNode
{
    unsigned int data;
    int next;
} TStaticListNode;

/* 静态链表结构体的定义 */
typedef struct _tag_StaticList
{
    int capacity;
    TStaticListNode header;
    TStaticListNode node[];
} TStaticList;

/* 静态链表的创建 */
StaticList* StaticList_Create(int capacity) // O(n)
{
    TStaticList* ret = NULL;
    int i = 0;
    
    if( capacity >= 0 )
    {
        ret = (TStaticList*)malloc(sizeof(TStaticList) + sizeof(TStaticListNode) * (capacity + 1));
    }
    
    if( ret != NULL )
    {
        ret->capacity = capacity;
        ret->header.data = 0;
        ret->header.next = 0;
        
        for(i=1; i<=capacity; i++)
        {
            ret->node[i].next = AVAILABLE;
        }
    }
    
    return ret;
}

void StaticList_Destroy(StaticList* list) // O(1)
{
    free(list);
}

void StaticList_Clear(StaticList* list) // O(n)
{
    TStaticList* sList = (TStaticList*)list;
    int i = 0;
    
    if( sList != NULL )
    {
        sList->header.data = 0;
        sList->header.next = 0;
        
        for(i=1; i<=sList->capacity; i++)
        {
            sList->node[i].next = AVAILABLE;
        }
    }
}

int StaticList_Length(StaticList* list) // O(1)
{
    TStaticList* sList = (TStaticList*)list;
    int ret = -1;
    
    if( sList != NULL )
    {
        ret = sList->header.data;
    }
    
    return ret;
}

int StaticList_Capacity(StaticList* list) // O(1)
{
    TStaticList* sList = (TStaticList*)list;
    int ret = -1;
    
    if( sList != NULL )
    {
        ret = sList->capacity;
    }
    
    return ret;
}

int StaticList_Insert(StaticList* list, StaticListNode* node, int pos)  // O(n)
{
    TStaticList* sList = (TStaticList*)list;
    int ret = (sList != NULL);
    int current = 0;
    int index = 0;
    int i = 0;
    
    ret = ret && (sList->header.data + 1 <= sList->capacity);
    ret = ret && (pos >=0) && (node != NULL);
    
    if( ret )
    {
        for(i=1; i<=sList->capacity; i++)
        {
            if( sList->node[i].next == AVAILABLE )
            {
                index = i;
                break;
            }
        }
        
        sList->node[index].data = (unsigned int)node;
        
        sList->node[0] = sList->header;
        
        for(i=0; (i<pos) && (sList->node[current].next != 0); i++)
        {
            current = sList->node[current].next;
        }
        
        sList->node[index].next = sList->node[current].next;
        sList->node[current].next = index;
        
        sList->node[0].data++;
        
        sList->header = sList->node[0];
    }
    
    return ret;
}

/* 获取第pos个元素的操作 */
StaticListNode* StaticList_Get(StaticList* list, int pos)  // O(n)
{
    TStaticList* sList = (TStaticList*)list;
    StaticListNode* ret = NULL;
    int current = 0;
    int object = 0;
    int i = 0;
    
    if( (sList != NULL) && (0 <= pos) && (pos < sList->header.data) )
    {
        sList->node[0] = sList->header;
        
        for(i=0; i<pos; i++)
        {
            current = sList->node[current].next;
        }
        
        object = sList->node[current].next;
        
        ret = (StaticListNode*)(sList->node[object].data);
    }
    
    return ret;
}

/* 删除第pos个元素操作 */
StaticListNode* StaticList_Delete(StaticList* list, int pos) // O(n)
{
    TStaticList* sList = (TStaticList*)list;
    StaticListNode* ret = NULL;
    int current = 0;
    int object = 0;
    int i = 0;
    
    if( (sList != NULL) && (0 <= pos) && (pos < sList->header.data) )
    {
        sList->node[0] = sList->header;
        
        for(i=0; i<pos; i++)
        {
            current = sList->node[current].next;
        }
        
        object = sList->node[current].next;
        
        sList->node[current].next = sList->node[object].next;
        
        sList->node[0].data--;
        
        sList->header = sList->node[0];
        
        sList->node[object].next = AVAILABLE;
        
        ret = (StaticListNode*)(sList->node[object].data);
    }
    
    return ret;
}

测试代码如下：

#include <stdio.h>
#include <stdlib.h>
#include "StaticList.h"
/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main(int argc, char *argv[])
{
    StaticList* list = StaticList_Create(10);
    
    int index = 0;
    
    int i = 0;
    int j = 1;
    int k = 2;
    int x = 3;
    int y = 4;
    int z = 5;
    
    StaticList_Insert(list, &i, 0);
    StaticList_Insert(list, &j, 0);
    StaticList_Insert(list, &k, 0);
    
    for(index=0; index<StaticList_Length(list); index++)
    {
        int* p = (int*)StaticList_Get(list, index);
        
        printf("%d\n", *p);
    }
    
    printf("\n");
    
    while( StaticList_Length(list) > 0 )
    {
        int* p = (int*)StaticList_Delete(list, 0);
        
        printf("%d\n", *p);
    }
    
    printf("\n");
    
    StaticList_Insert(list, &x, 0);
    StaticList_Insert(list, &y, 0);
    StaticList_Insert(list, &z, 0);
    
    printf("Capacity: %d Length: %d\n", StaticList_Capacity(list), StaticList_Length(list));
    
    for(index=0; index<StaticList_Length(list); index++)
    {
        int* p = (int*)StaticList_Get(list, index);
        
        printf("%d\n", *p);
    }
    
    StaticList_Destroy(list);
    
    return 0;
}

 运行结果如下：