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C语言刷题       数据结构初阶

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目录

1.前言

2.带头双向循环链表函数实现

3.总结

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