单向链表的复杂操作

1、删除链表节点

int DeleteLinkList(LinkNode *pHead, DataType TmpData)
{
    LinkNode *pPreNode = NULL;
    LinkNode *pTmpNode = NULL;
    int cnt = 0;
 
    pPreNode = pHead;
    pTmpNode = pHead->pNext;
    while (pTmpNode != NULL)
    {
        if (pTmpNode->Data == TmpData)
        {
            //删除
            pPreNode->pNext = pTmpNode->pNext;
            free(pTmpNode);
            pTmpNode = pPreNode->pNext;
            cnt++;
        }
        else 
        {
            pTmpNode = pTmpNode->pNext;
            pPreNode = pPreNode->pNext;
        }
    }
 
    return cnt;
}

2、销毁链表

int DestroyLinkList(LinkNode **ppHead)
{
    LinkNode *pTmpNode = NULL;
    LinkNode *pFreeNode = NULL;
 
    pTmpNode = pFreeNode = *ppHead;
    while (pTmpNode != NULL)
    {
        pTmpNode = pTmpNode->pNext;
        free(pFreeNode);
        pFreeNode = pTmpNode;
    }
    *ppHead = NULL;
 
    return 0;
}

3、寻找链表的中间节点位置

LinkNode *FindMidLinkNode(LinkNode *pHead)
{
    LinkNode *pFast = NULL;
    LinkNode *pSlow = NULL;
 
    pFast = pSlow = pHead->pNext;
    while (pFast != NULL)
    {
        pFast = pFast->pNext;
        if (NULL == pFast)
        {
            break;
        }
        pFast = pFast->pNext;
        if (NULL == pFast)
        {
            break;
        }
 
        pSlow = pSlow->pNext;
    }
 
    return pSlow;
}

功能：找到中间节点位置
算法原理：
快指针pFast每次走2步，慢指针pSlow每次走1步，快指针到达末尾时，慢指针所在的位置即为中间位置 。

4、寻找链表倒数第K个节点

LinkNode *FindLastKthLinkNode(LinkNode *pHead, int k)
{
    LinkNode *pFast = pHead->pNext;
    LinkNode *pSlow = pHead->pNext;
    int i = 0;
 
    for (i = 0; i < k; i++)
    {
        pFast = pFast->pNext;
        if (NULL == pFast)
        {
            break;
        }
    }
 
    if (NULL == pFast)
    {
        return NULL;
    }
 
    while (pFast != NULL)
    {
        pSlow = pSlow->pNext;
        pFast = pFast->pNext;
    }
 
    return pSlow;
}

功能：找到链表倒数第k个节点
算法原理：
快指针先走k步，慢指针和快指针每次走1步(快指针总是领先慢指针k步)，当快指针走到末尾时,慢指针即指向链表倒数第k个节点 。

5、倒置链表

int ReversalLinkList(LinkNode *pHead)
{
    LinkNode *pTmpNode = NULL;
    LinkNode *pInsertNode = NULL;
 
    pTmpNode = pHead->pNext;
    pHead->pNext = NULL;
    pInsertNode = pTmpNode;
 
    while (pTmpNode != NULL)
    {
        pTmpNode = pTmpNode->pNext;
        pInsertNode->pNext = pHead->pNext;
        pHead->pNext = pInsertNode;
        pInsertNode = pTmpNode;
    }
 
    return 0;
}

6、链表的冒泡排序 

int BubbleSortLinkList(LinkNode *pHead)
{   
    LinkNode *pTmpNode1 = NULL;
    LinkNode *pTmpNode2 = NULL;
    LinkNode *pEnd = NULL;
    DataType TmpData;
 
    //如果链表没有节点或者只有1个节点返回0 
    if (NULL == pHead->pNext || NULL == pHead->pNext->pNext)
    {
        return 0;
    }
 
    while (1)
    {
        pTmpNode1 = pHead->pNext;
        pTmpNode2 = pHead->pNext->pNext;
        if (pTmpNode2 == pEnd)
        {
            break;
        }
 
        while (pTmpNode2 != pEnd)
        {
            if (pTmpNode1->Data > pTmpNode2->Data)
            {
                TmpData = pTmpNode1->Data;
                pTmpNode1->Data = pTmpNode2->Data;
                pTmpNode2->Data = TmpData;
            }
            pTmpNode1 = pTmpNode1->pNext;
            pTmpNode2 = pTmpNode2->pNext;
        }
        pEnd = pTmpNode1;
    }
    
    return 0;
}

7、链表的选择排序

//选择排序
int SelectSortLinkList(LinkNode *pHead)
{
    LinkNode *pTmpNode = NULL;
    LinkNode *pMinNode = NULL;
    LinkNode *pSwapNode = NULL;
    DataType TmpData;
 
    if (NULL == pHead->pNext)
    {
        return 0;
    }
 
    pSwapNode = pHead->pNext;
 
    while (pSwapNode->pNext != NULL)
    {
        pMinNode = pSwapNode;
        pTmpNode = pSwapNode->pNext;
        while (pTmpNode != NULL)
        {
            if (pTmpNode->Data < pMinNode->Data)
            {
                pMinNode = pTmpNode;
            }
            pTmpNode = pTmpNode->pNext;
        }
        if (pMinNode != pSwapNode)
        {
            TmpData = pMinNode->Data;
            pMinNode->Data = pSwapNode->Data;
            pSwapNode->Data = TmpData;
        }
        pSwapNode = pSwapNode->pNext;
    } 
 
    return 0;
}