数据结构-6-复杂链表复制

复制复杂链表：一个链表的每一个节点，有一个指向下一个节点的next，还有一个指向随机节点或者NULL的random指针。

链表复制起来，很简单，数据复制，链起来就可以了。而这个复杂链表的random复制起来就不容易了。
在原链表复制过程中，采用复制的新链表的节点链在原节点之后，这样新链表的random就是原链表random->next。

// 复杂链表复制 
#pragma once
#include<stdio.h>
#include<Windows.h>
#include<assert.h>


typedef struct ComplexListNode
{
    int data;
    struct ComplexListNode* next;
    struct ComplexListNode* random;
}ComplexListNode;


void ComplexListPrint(ComplexListNode*list)
{
    ComplexListNode*cur = list;
    while (cur)
    {
        if (cur->random==NULL)
        {
            printf("%d:NULL", cur->data);
            cur = cur->next;    
        }
        else
        {
            printf("%d:%d  ", cur->data,cur->random->data);
            cur = cur->next;
        }
    }
}
ComplexListNode* BuyComplexNode(int x)
{
    ComplexListNode*newnode = (ComplexListNode*)malloc(sizeof(ComplexListNode));
    assert(newnode);

    newnode->data = x;
    newnode->next = NULL;
    newnode->random = NULL;

    return newnode;
}
ComplexListNode* CopyComplexList(ComplexListNode* list);//复杂链表的复制。一个链表的每个节点，有一个指向next指针指向
//下一个节点，还有一个random指针指向这个链表中的一个随机节点或者NULL，现在要求实现复制这个链表，返回复制后的新链表。
ComplexListNode* CopyComplexList(ComplexListNode*list)
{
    ComplexListNode*new = NULL, *tail = NULL;
    //1、逐个复制结点
    ComplexListNode*cur = list;
    if (cur == NULL)
        return NULL;
    while (cur)
    {
        ComplexListNode*newnode = BuyComplexNode(cur->data);
        ComplexListNode*next = cur->next;

        cur->next = newnode;
        newnode->next=next;

        cur = newnode->next;
    }

    //2、置random
    cur = list;
    while (cur)
    {
        ComplexListNode*copy = cur->next;
        if (cur->random == NULL)
        {
            copy->random = NULL;
            cur = cur->next->next;
        }
        else
        {
            copy->random = cur->random->next;
            cur = cur->next->next;
        }
    }
    //3、拆开,分别链起来
    new = tail = list->next;
    list->next = new->next;
    cur = list->next;
    while (cur)
    {
        ComplexListNode*copy=cur->next;
        cur->next = copy->next;

        tail->next = copy;
        tail = copy;

        cur = cur->next;
    }
    return new;
}

//测试部分
void ComplexListNodeTest()
{
    ComplexListNode*copylist=NULL;
    ComplexListNode*n1 = BuyComplexNode(1);
    ComplexListNode*n2 = BuyComplexNode(2);
    ComplexListNode*n3 = BuyComplexNode(3);
    ComplexListNode*n4 = BuyComplexNode(4);

    n1->next = n2;
    n2->next = n3;
    n3->next = n4;
    n4->next = NULL;
    n1->random = n3;
    n2->random = n1;
    n3->random = n3;
    n4->random = NULL;
    ComplexListPrint(n1);
    printf("\n");
    copylist=CopyComplexList(n1);
    ComplexListPrint(copylist);
}