学步园

数据结构笔记二(20120819)

/*
 *
 * wuxiuwen
 * 20120821 
 * 双向链表的创建，删除节点，插入节点，链表排序，节点的倒序输出，
 * 
 */

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

typedef struct node
{
	int data;
	struct node *next;
	struct node *front;
	
}DNode;

void creatlist(DNode **);
void outputlist(DNode *);
void freelist(DNode **);
DNode *Getnode(int);
DNode *insertlist_node(DNode *,DNode *);
DNode *rm_listnode(DNode *,DNode *);
DNode *sort_listnode(DNode *);
DNode *reverse_list(DNode *);
int main()
{
	DNode *head =NULL;
	DNode *pnew=NULL;
	creatlist(&head);
	printf("创建的节点是:\n");
	outputlist(head);

	printf("排序结果如下：\n");
	head = sort_listnode(head);
	outputlist(head);
	
	pnew = Getnode(5);
	printf("插入data为%d到有序序列为：\n",5);
	head = insertlist_node(head,pnew);
	outputlist(head);
	
	printf("删除增加的节点:\n");
	head = rm_listnode(head,pnew);
	outputlist(head);

/*	head = reverse_list(head);
	printf("倒序输出链表为：\n");
	outputlist(head);
*/	
	freelist(&head);
	return 0;
}
DNode *reverse_list(DNode *head)
{
	DNode *headnew =NULL;
	DNode *p1 = NULL;
	DNode *p2 = NULL;
	DNode *p3 = NULL;
	headnew = (DNode *)malloc(sizeof(DNode));
	headnew->next =headnew->front =NULL;
	p2 = headnew;
	head = head ->next;
	if(head ==NULL)
	{
		return head;
	}	
	while(head !=NULL)
	{
		p1 = head ;
		head = head ->next;
	}
	headnew = headnew->next;
	while(p1 != NULL)
	{
			p3 = p1;
			p3 ->next = NULL;
			p3 ->front = NULL;
			p1 = p1->front;
			p2->front = headnew;
			p2->next = NULL;
			headnew->next=p2; 
	}
	return p2;
}
DNode *sort_listnode(DNode *head)
{
	DNode *p1=NULL;
	DNode *p2=NULL;
	DNode *headnew = NULL;
	headnew = (DNode *)malloc(sizeof(DNode));
	headnew->next =headnew->front =NULL;
	p2 = headnew;
	head = head ->next;
	while(head !=NULL)
	{
		p1 = head;
		head = head ->next;
		p1 ->next = NULL;
		headnew = insertlist_node(headnew,p1);
	} 
	return p2;
}
DNode *rm_listnode(DNode *head,DNode *pdel)
{//查询链表中有这个节点pdel,有的话删除掉
	
	DNode *p = head;
	if(head ==NULL && head ->next ==NULL)
	{
		return head;
	}	
	while(p !=NULL && p!=pdel)
	{
		p=p->next;
	}
	if(p  ==NULL && p !=pdel)
	{
		printf("no!");
		return head;
	}
	if(p == pdel && p ->next==NULL)
	{
		p->front->next =NULL;
	}
	if(p == pdel && p->next!=NULL)
	{
		p->front->next=p->next;
		p->next->front=p->front;
	}
	free(pdel);
	return head;
}	
DNode *insertlist_node(DNode *head,DNode *pnew)     
//插入的队列是从小到大的有序序列
{
	DNode *p1=head;
	DNode *p2=NULL;
	head = head ->next;
	if(head  ==NULL)
	{
		pnew ->front = p1;
		pnew ->next = NULL;
		p1->next=pnew;
		return p1;
	}
	while(head != NULL)
	{	
		if(head->data < pnew->data)
		{
			p2 =head;
			head = head->next;
		}
		else break;
	}
	if(head==NULL)
	{
		pnew->front=p2;
		pnew->next = NULL;
		p2->next = pnew;
	}
	if(head != NULL && head->data >= pnew->data)
	{
		pnew->front = p2;
                pnew->next = head;
                p2->next = pnew;
                head->front=pnew;		
	}
	return p1;
}


DNode *Getnode(int num)
{
	DNode *p=(DNode *)malloc(sizeof(DNode));
	p->data = num;
	p->next =NULL;
	return p;
}

void creatlist(DNode **phead)
{
	DNode *pnew=NULL;
	int num;
	DNode *pend =NULL;
	DNode **head;

	*phead = (DNode *)malloc(sizeof(DNode));
	(*phead)->next =(*phead)->front =NULL;
	
	head = &((*phead)->next);
	scanf("%d",&num);
	while(num !=0)
	{
		pnew = Getnode(num);
		if(*head ==NULL)
		{
			*head = pend = pnew;
			pnew->front = *phead;	
		}
		else
		{
			pend->next = pnew;
			pnew->front = pend;
			pend = pnew;
		}
		scanf("%d",&num);
	}		
 
}
void outputlist(DNode *head)
{
	DNode *p = NULL;
	head  = head ->next;
	while(head !=NULL)
	{
		printf("%d ",head->data);
		p = head;
		head = head ->next;
	}
/*	printf("\n*******逆向输出******\n");
	while(p->front !=NULL)
	{
		printf("%d ",p->data);
		p = p->front;
	}
*/
	printf("\n");
}
void freelist(DNode **head)
{
	DNode *pdel =NULL;
	printf("\n释放空间的链表为：\n");
	while(*head !=NULL)
	{
		pdel = *head;
		*head = (*head)->next;
		printf("%d ",pdel ->data);
		free(pdel);
	}
	printf("\n");
}

*********************************************************************************************************

程序运行结果：

[root@localhost wuxiuwen]# ./a.out
2 6 9 0
创建的节点是:
2 6 9
排序结果如下：
2 6 9
插入data为5到有序序列为：
2 5 6 9
删除增加的节点:
2 6 9

释放空间的链表为：
0 2 6 9
[root@localhost wuxiuwen]#

 ****************************************************************************************************************