SeqList 简单的线性表实现

Posted 2020-11-17 randyniu

用数据来实现顺序链表，将上层逻辑和底层链表的实现进行了分离，底层用void指针来满足所有类型的数据元素，上层需要传递对应的元素类型，并分配内存空间，底层不进行内存的管理工作。

// 接口
#ifndef  _SEQLIST_H__ 
#define  _SEQLIST_H__

typedef void SeqList;
typedef void SeqListNode;

//链表 创建
SeqList* SeqList_Create(int capacity);

//链表 销毁
void SeqList_Destroy(SeqList* list);

////链表 清空
void SeqList_Clear(SeqList* list);

//链表 长度
int SeqList_Length(SeqList* list);

//链表 容量 
int SeqList_Capacity(SeqList* list);

//链表 在某一个位置 插入元素
int SeqList_Insert(SeqList* list, SeqListNode* node, int pos);

//获取某一个位置的链表结点
SeqListNode* SeqList_Get(SeqList* list, int pos);

//删除某一个位置的结点
SeqListNode* SeqList_Delete(SeqList* list, int pos);


#endif  //__SEQLIST_H__

#include <stdlib.h>
#include <string.h>
#include <stdio.h>

#include "seqlist.h"

//用数组来模拟线性表
typedef struct _tag_SeqList
{
    int        capacity; //存放构造链表时候的数据容量。
    int        length; // 存放链表中实际的数量。
    int        **node; //用来存放每个链表的数据地址。
}TSeqList;

//链表 创建
SeqList* SeqList_Create(int capacity) //O(1)
{
    int            ret;
    TSeqList    *tmp = NULL;
    tmp = (TSeqList *)malloc(sizeof(TSeqList));
    if (tmp == NULL)
    {
        ret = 1;
        printf("func SeqList_Create() err :%d 
", ret);
        return NULL;
    }
    memset(tmp, 0, sizeof(TSeqList));
    tmp->capacity = capacity;
    tmp->length = 0;
    tmp->node = (int **)malloc(sizeof(void *) * capacity);
    if (tmp->node == NULL)
    {
        ret = 2;
        printf("func SeqList_Create() malloc err :%d 
", ret);
        return NULL;
    }
    memset(tmp->node, 0, sizeof(void *) * capacity);

    return tmp;
}

//链表 创建
int SeqList_Create2(int capacity, SeqList**handle)
{
    int            ret = 0;
    TSeqList    *tmp = NULL;
    tmp = (TSeqList *)malloc(sizeof(TSeqList));
    if (tmp == NULL)
    {
        ret =1;
        printf("func SeqList_Create2() err :%d 
", ret);
        return ret;
    }
    memset(tmp, 0, sizeof(TSeqList));
    tmp->capacity = capacity;
    tmp->length = 0;
    tmp->node = (int **)malloc(sizeof(void *) * capacity);
    if (tmp->node == NULL)
    {
        ret = 2;
        printf("func SeqList_Create2() malloc err :%d 
", ret);
        return ret;
    }

    *handle = tmp;
    return ret;
}

//链表 销毁
void SeqList_Destroy(SeqList* list)  //O(1)
{
    TSeqList    *tmp = NULL;
    if (list == NULL)
    {
        return ;
    }

    tmp = (TSeqList *)list;

    if (tmp->node != NULL)
    {
        free(tmp->node);
    }
    free(tmp);
    return ;
}


//链表 清空
void SeqList_Clear(SeqList* list) //O(1)
{
    TSeqList    *tmp = NULL;
    if (list == NULL)
    {
        return ;
    }

    tmp = (TSeqList *)list;
    tmp->length = 0;
    memset(tmp->node, 0, (tmp->capacity * sizeof(void *)) );

    return ;
}


//链表 长度
int SeqList_Length(SeqList* list) //O(1)
{
    TSeqList    *tmp = NULL;
    if (list == NULL)
    {
        return -1;
    }
    tmp = (TSeqList *)list;

    return tmp->length;
}


//链表 容量 
int SeqList_Capacity(SeqList* list) //O(1)
{
    TSeqList    *tmp = NULL;
    if (list == NULL)
    {
        return -1;
    }
    tmp = (TSeqList *)list;
    return tmp->capacity;
}

//链表 在某一个位置 插入元素
int SeqList_Insert(SeqList* list, SeqListNode* node, int pos)  //O(n)
{
    TSeqList    *tList = NULL;
    int i = 0;
    if (list == NULL ||  node==NULL)
    {
        return -1;
    }
    tList = (TSeqList *)list;
    //如果满了 
    if (tList->length >= tList->capacity)
    {
        return -2;
    }

    //pos位置的容错处理
    if (pos > tList->length )
    {
        pos = tList->length;
    }

    for (i=tList->length; i>pos; i--)  //n
    {
        tList->node[i] = tList->node[i-1];
    }

    tList->node[i] = (int* )node; //ok
    tList->length ++;

    return 0;
}

//获取某一个位置的链表结点
SeqListNode* SeqList_Get(SeqList* list, int pos)  //O(1)
{
    TSeqList    *tList = NULL;
    SeqListNode *tmp = NULL;

    tList = (TSeqList *)list;

    if (list == NULL || pos < 0 || pos >= tList->length )
    {
        return NULL;
    }
    tmp = tList->node[pos];

    return tmp;
}

//删除某一个位置的结点 
SeqListNode* SeqList_Delete(SeqList* list, int pos)  ////O(n)
{
    int            i = 0;
    TSeqList    *tList = NULL;
    SeqListNode *tmp = NULL; 

    tList = (TSeqList *)list;
    if (list == NULL || pos <0 || pos >= tList->length)
    {
        return NULL;
    }
    tmp = tList->node[pos];

    // pos = 3
    for (i=pos+1; i<tList->length; i++)
    {
        tList->node[i-1] = tList->node[i];

    }
    tList->length --;
    return tmp;
}

优缺点和明显，查找循序，插入和删除需要移动所有的元素。