数据结构之双向带头循环链表函数功能实现与详细解析

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目录

1.前言

        在前面我们写过单链表，循环链表的博客，今天我主要给大家来带关于双向带头循环链表函数的功能与实现，双向带头循环链表相对于单链表，循环链表非常的容易实现，他的函数的功能和 单链表，循环链表一样，如果你想要快速实现一个链表的所有功能，带头双向循环链表非常的容易，接下来让我们看看带头双向链表的奥妙把，看完你绝对会佩服写出这种结构的人。

2.带头双向循环链表函数实现

#include<stdio.h>
#include<stdlib.h>
#include <assert.h>
typedef struct ListNode {
	int data;
	struct ListNode* prev, * next;
}ListNode;
ListNode* ListCreate(int x)
{
	ListNode* newnode = (ListNode*)malloc(sizeof(ListNode));
	if (newnode == NULL)
	{
		perror("malloc");
		return NULL;
	}
	newnode->next = NULL;
	newnode->prev = NULL;
	newnode->data = x;
	return newnode;
}
ListNode* LInit()
{
	ListNode* head = ListCreate(-1);
	head->next = head;
	head->prev = head;
	return head;
}
void ListDestory(ListNode* phead)
{
	assert(phead);
	ListNode* cur = phead->next, * prev = phead;
	while (prev != phead)
	{
		free(prev);
		prev = cur;
		cur = cur->next;
	}
}
void ListPrint(ListNode* phead)
{
	assert(phead);
	ListNode* cur = phead->next;
	printf("哨兵位<=>");
	while (cur != phead)
	{
		printf("%d<=>", cur->data);
		cur = cur->next;
	}
	printf("\n");
}
void ListPushBack(ListNode* phead, int x)
 {
	assert(phead);
	ListNode* newnode = ListCreate(x);
	ListNode* tail = phead->prev;
	tail->next = newnode;
	newnode->prev = tail;
	newnode->next = phead;
	phead->prev = newnode;
}
void ListPushFrount(ListNode* phead, int x)
{
	assert(phead);
	ListNode* newnode = ListCreate(x);
	ListNode* cur = phead->next;
	phead->next = newnode;
	newnode->prev = phead;
	newnode->next = cur;
	cur->prev = newnode;
}
void ListPopBack(ListNode* phead)
{
	assert(phead && phead->next != phead);
	ListNode* cur = phead->prev;
	cur->prev->next = phead;
	phead->prev = cur->prev;
	free(cur);
}
void ListPopFrount(ListNode* phead)
{
	assert(phead && phead->next != phead);
	ListNode* cur = phead->next;
	phead->next = cur->next;
	cur->next->prev = phead;
	free(cur);
}
ListNode* ListFind(ListNode* phead, int x)
{
	assert(phead);
	ListNode* cur = phead->next;
	while (cur->data != x)
	{
		cur = cur->next;
	}
	return cur;
}
void ListInsert(ListNode* pos, int x)
{
	assert(pos);
	ListNode* newnode = ListCreate(x);
	ListNode* cur = pos->prev;
	cur->next = newnode;
	newnode->prev = cur;
	newnode->next = pos;
	pos->prev = newnode;
}
void ListErase(ListNode* pos)
{
	assert(pos);
	ListNode* cur = pos->next;
	ListNode* prev = pos->prev;
	free(pos);
	cur->prev = prev;
	prev->next = cur;
}
void text1()
{
	ListNode* head = LInit();
	ListPushBack(head, 1);
	ListPushBack(head, 2);
	ListPushBack(head, 3);
	ListPushBack(head, 4);
	ListPushBack(head, 5);
	ListPushFrount(head, 0);
	ListPrint(head);
	ListPopBack(head);
	ListPrint(head);
	ListPopBack(head);
	ListPrint(head);
	ListPopFrount(head);
	ListPrint(head);
	ListPopFrount(head);
	ListPrint(head);
	ListPushBack(head, 4);
	ListPushBack(head, 5);
	ListNode* cur = ListFind(head,3);
	ListPushFrount(head, 1);
	ListPushFrount(head, 0);	
	printf("%d\n", cur->data);
	ListPrint(head);
	ListInsert(head, 10);
	ListPrint(head);
}

3.总结

        带头双向循环的链表非常的好，接下俩我们对顺序表和链表的存储空间，随机访问，任意位置插入或删除元素，插入，缓存利用率，应用场景进行分析