删除链表中的重复节点、剩余节点逆序输出

标签：华为入职练习 华为oj

#include <stdlib.h>
#include <algorithm>
#include <functional>
#include <iostream>
#include "oj.h"
using namespace std;


/*
功能:  输入一个不带头节点的单向链表(链表的节点数小于100),删除链表中内容重复的节点（重复的节点全部删除），剩余的节点逆序倒排。
    
输入:   pstrIn： 输入一个不带头节点的单向链表
    
输出:   pstrOut：删除内容重复的节点后，逆序排列的链表(不带头节点,链表第一个节点的内存已经申请)。
     
返回:

示例:
输入链表的内容依次为 6,7,8,8,9,10,6
则输出链表的内容依次应该是 10,9,7
     
*/


int iChanProcess(strNode * pstrIn,strNode * pstrOut)
{
	if (NULL == pstrIn || NULL == pstrOut)
	{
		return -1;
	}
	strNode *pCur = pstrIn;
	int len = 0;
	while (NULL != pCur)
	{
		len++;
		pCur = pCur->pstrNext;
	}

	int *iArray = new int [len];
	pCur = pstrIn;
	int iCur =0;
	while (NULL != pCur)
	{
		iArray[iCur] = pCur->data;
		iCur++;
		pCur = pCur->pstrNext;
	}
	sort(iArray,iArray + len, greater<int>());
	pCur = pstrOut;
	iCur = 0;
	int flag = 0; //标记输出的第一个节点是否被使用
	
	int *iArrayTemp = new int [len];

	memset(iArrayTemp, 0 , sizeof(int) * len);

	int iCurTemp =0;
	int tempLen = 0;

	
	if (iArray[iCur] ==  iArray[iCur + 1])	//处理第一节点
	{
		iCur ++;
	}
	else
	{
		iArrayTemp[iCurTemp] = iArray[iCur];
		iCurTemp++;
		iCur++;
	}

	for (;  iCur < len -1; ++iCur)
	{
		if (iArray[iCur] == iArray[iCur - 1] ||iArray[iCur] == iArray[iCur + 1])
		{
			continue;
		}
		else
		{
			iArrayTemp[iCurTemp] = iArray[iCur];
			iCurTemp++;
		}
	}

	if (iArray[iCur] != iArray[iCur - 1] )	//处理最后一个节点
	{
		iArrayTemp[iCurTemp] = iArray[iCur];
		iCurTemp++;
		
	}


	int iTempLen = iCurTemp;
	pCur = pstrOut;
	pCur->data = iArrayTemp[0];
	pCur->pstrNext = NULL ;

	for (int i = 1; i < iCurTemp ; ++ i )
	{
		strNode *node = new strNode;
		node->data = iArrayTemp[i];
		node->pstrNext =NULL;
		pCur->pstrNext = node;
		pCur = pCur->pstrNext;
	}
	
	return 0;
}

/* 释放链表 */
void vFreeChan(strNode * pstrChan)
{
    if (NULL == pstrChan)
    {
		return ;
    }
	strNode * pCur = pstrChan;
	strNode * pNext = pstrChan;
	while (NULL != pCur)
	{
		pNext = pCur->pstrNext;
		delete pCur;
		pCur = NULL;
		pCur = pNext;
	}

    return;
}



strNode *vCreatChan(int * piData, int iNum)
{
	int       iLoop         = 0;
	strNode * pstrChanHead  = NULL;
	strNode * pstrChanEnd   = NULL;
	strNode * pstTemp       = NULL;

	if ((NULL == piData) || (iNum < 1))
	{
		return NULL;
	}

	pstrChanHead = (strNode *)malloc(sizeof(strNode));
	pstrChanHead->data     = *piData;
	pstrChanHead->pstrNext = NULL;

	pstrChanEnd = pstrChanHead;

	for (iLoop = 1; iLoop < iNum; iLoop++)
	{
		pstTemp = (strNode *)malloc(sizeof(strNode));
		pstTemp->data = piData[iLoop];
		pstTemp->pstrNext = NULL;

		pstrChanEnd->pstrNext = pstTemp;
		pstrChanEnd = pstrChanEnd->pstrNext;
	}

	return pstrChanHead;
}

int iChanToArray(strNode *pstrChan, int * piData, int * piLenth)
{
	int      iLoop    = 0;
	strNode *pstrTemp = pstrChan;

	if ((NULL == pstrChan) || (NULL == piData) || (NULL == piLenth))
	{
		return -1;
	}

	while(NULL != pstrTemp)
	{
		*(piData + iLoop) = pstrTemp->data;
		pstrTemp = pstrTemp->pstrNext;
		iLoop++;
	}

	*piLenth = iLoop;

	return 0;
}


int main()
{
	strNode * pstrIn  = NULL;
	strNode * pstrOut = NULL;
	int  iLenth  = 0;
	int  iaDataIn[7]    = {6, 7, 8, 8 ,9, 10, 6};
	int  iaDataOut[7]   = {10,9,7};
	int  iaDataMyOut[7] = {0};

	pstrIn = vCreatChan(iaDataIn, 7);
	pstrOut = (strNode *)malloc(sizeof(strNode));
	pstrOut->pstrNext = NULL;
	/* TODO: 调用被测函数 */
	//请考生自己构造单向链表进行测试
	iChanProcess(pstrIn,pstrOut);

	/* TODO: 执行完成后可比较是否是你认为正确的值 */
	iChanToArray(pstrOut, iaDataMyOut, &iLenth);
	//printf("%d\n",pstrOut->data);
	//CPPUNIT_ASSERT(3 == iLenth);
	//CPPUNIT_ASSERT(0 == memcmp((char *)iaDataOut, (char *)iaDataMyOut, sizeof(int) * iLenth));

	/* 释放内存*/
	vFreeChan(pstrIn);
	vFreeChan(pstrOut);
	return 0;
}

删除链表中的重复节点、剩余节点逆序输出

标签：华为入职练习 华为oj

原文地址：http://blog.csdn.net/xiaohanstu/article/details/42582279