C语言之复杂链表的复制详解

typedef int DataType; //数据域的类型
//复杂链表的数据结构
typedef struct ComplexNode

{

DataType _data ;   // 数据
struct ComplexNode * _next;  // 指向下个节点的指针
struct ComplexNode * _random; // 指向随机节点（可以是链表中的任意节点 or 空）

}ComplexNode; 

#ifndef __COMPLEX__NODE__H__
#define __COMPLEX__NODE__H__
//包含头文件
#include <stdio.h>
#include<stdlib.h>
#include <assert.h>

typedef int DataType; //数据域的类型
//复杂链表的数据结构
typedef struct ComplexNode

{
DataType _data ;    // 数据
struct ComplexNode * _next;  // 指向下个节点的指针
struct ComplexNode * _random; // 指向随机节点（可以是链表中的任意节点 or 空）
}ComplexNode;

 

//创建一个复杂链表的结点
ComplexNode * BuyComplexNode(DataType x);
//打印复杂的单链表
void Display(const ComplexNode * cplist);
//复杂链表的复制
ComplexNode * CopyComplexNode(ComplexNode * cplist);

 

#endif//__COMPLEX__NODE__H__

#include "complexnode.h"

 

//创建一个复杂链表的结点

ComplexNode * BuyComplexNode(DataType x)
{
ComplexNode *cnode = (ComplexNode *)malloc(sizeof(ComplexNode));
if(cnode == NULL)//创建失败
{

perror("BuyComplexNode()::malloc");
return NULL;

}

//创建成功
cnode->_data = x;
cnode->_next = NULL;
cnode->_random = NULL;
return cnode;

} 

//打印复杂的单链表

void Display(const ComplexNode * cplist)

{

ComplexNode *pnode = cplist;
while (pnode)
{
printf("%d::%d -->",pnode->_data,pnode->_random->_data);
pnode = pnode->_next;

}

printf("over\n");

}

//复杂链表的复制
ComplexNode * CopyComplexNode(ComplexNode * cplist)

{
ComplexNode * pold = NULL;
ComplexNode * pnew = NULL;
ComplexNode * newlist = NULL;//指向新的复杂链表的头结点的指针
pold = cplist;

//创建一条新的复杂链表

while(pold != NULL)

{
ComplexNode * new_node = BuyComplexNode(pold->_data);
if(newlist == NULL)//当新的复杂链表中没有结点时
{
newlist = new_node;

}

else//当新的复杂链表有结点时

{
ComplexNode * node = newlist;
while(node->_next != NULL)//找到最后一个结点
{
node = node->_next;
}
node->_next = new_node;//插入新的结点
}
pold = pold->_next;

 

}//创建新的复杂链表结束

 

//合并两条复杂链表
pold = cplist;
pnew = newlist;
while (pold)

{

ComplexNode * curold = NULL;
ComplexNode * curnew = NULL;
curold = pold->_next;
curnew = pnew->_next;
if(pold->_next == NULL)

{

pold->_next = pnew;
pold = curold;
pnew = curnew;
break;

}

pold->_next = pnew;
pnew->_next = curold;
pold = curold;
pnew = curnew;
}//合并两条复杂链表结束

 

//让新创建的那条复杂链表上的所有结点的random指针指向相应的结点
pold = cplist;
pnew = newlist;
while (pnew)

{

pnew->_random = pold->_random->_next;

pold = pnew->_next;
if(pold == NULL)//这是pnew的_next指针已经指向空

{

break;

}

pnew = pold->_next;

}//结束

 

//分离合并后的复杂链表

pold = cplist;
pnew = newlist;
while (pold)

{

ComplexNode * curold = NULL;
ComplexNode * curnew = NULL;
if(pnew->_next == NULL)//已经分离完成

{

pold->_next = NULL;
pnew->_next = NULL;
break;

 

}

curold = pold->_next->_next;
curnew = pnew->_next->_next;

 

pold->_next = curold;
pnew->_next = curnew;
pold = curold;
pnew = curnew;

}//分离合并的复杂链表结束

 

return newlist;

}

测试代码test.c：

#include "complexnode.h"

//
//复杂链表的复制。?个链表的每个节点，有?个指向next指针指向下?个节
//点，还有?个random指针指向这个链表中的?个随机节点或者NULL，现在要
//求实现复制这个链表，返回复制后的新链表。
//ps: 复杂链表的结构
 

void test()

{

ComplexNode * cplist;
ComplexNode * copylist;
ComplexNode * node1;
ComplexNode * node2;
ComplexNode * node3;
ComplexNode * node4;
cplist = BuyComplexNode(1);
node1 = BuyComplexNode(2);
node2 = BuyComplexNode(3);
node3 = BuyComplexNode(4);
node4 = BuyComplexNode(5);
cplist->_next = node1;
node1->_next = node2;
node2->_next = node3;
node3->_next = node4;
cplist->_random = node3;
node1->_random = node4;
node2->_random = cplist;
node3->_random = node1;
node4->_random = node2;
Display(cplist);
copylist = CopyComplexNode(cplist);
Display(copylist);


}
int main()
{
test();
return 0;

}