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循环单链表实现

时间:2019-05-02 13:11:47      阅读:133      评论:0      收藏:0      [点我收藏+]

标签:ast   结构体   atm   ret   创建   sizeof   0ms   imsi   join   

 
/********************************************************
* SClist.h头文件
/********************************************************/
#ifndef __SCLIST_H__
#define __SCLIST_H__
 
#include<stdio.h>
#include<malloc.h>
#include<assert.h>
 
typedef int ElemType;
 
typedef struct Node { //定义结构体
    ElemType data;
    struct Node *next;
}Node,*PNode;
 
typedef struct List { //定义头尾节点及链表长度
    PNode first;
    PNode last;
    size_t size;
}List;
 
void InitSClist(List *list);//初始化循环单链表
void push_back(List *list, ElemType x);//在循环单链表的末尾插入元素
void push_front(List *list, ElemType x);//在循环单链表的头部插入元素
void show_list(List *list);//打印循环单链表
void pop_back(List *list);//删除循环单链表的最后一个元素
void pop_front(List *list);//删除循环单链表的第一个元素
void insert_val(List *list, ElemType val);//将数据元素插入到循环单链表中(要求此时循环单链表中的数据元素顺序排列)
Node* find(List *list, ElemType x);//查找循环单链表中数据值为x的结点
int length(List *list);//求循环单链表的长度
void delete_val(List *list, ElemType x);//按值删除循环单链表中的某个数据元素
void sort(List *list);//对循环单链表进行排序
void reverse(List *list);//逆置循环单链表
void clear(List *list);//清除循环单链表
void destroy(List *list);//摧毁循环单链表
 
//优化
Node* _buynode(ElemType x);//创建结点
 
#endif
 
 
 
/********************************************************
* SClist.c文件
/********************************************************/
#include"SClist.h"
 
/* 创建新节点 */
Node* _buynode(ElemType x) {
    Node *s = (Node*)malloc(sizeof(Node));
    assert(s != NULL);
    s->data = x;
    s->next = NULL;
    return s;
}
 
/* 初始化链表 */
void InitSClist(List *list) {
    Node *s = (Node*)malloc(sizeof(Node));
    assert(s != NULL);
    list->first = list->last = s;
    list->last->next = list->first;//让链表最后一个结点的指针域指向头结点,从而时链表循环
    list->size = 0;
}
 
/* 尾部插入元素 */
void push_back(List *list, ElemType x) {
    Node *s = _buynode(x);
    list->last->next = s; //尾插
    list->last = s; //赋地址
    list->last->next = list->first;
    list->size++;
}
 
/* 头部插入元素 */
void push_front(List *list, ElemType x) {
    Node *s = _buynode(x);
    s->next = list->first->next; //头插
    list->first->next = s;
    if (list->last == list->first)
        list->last = s;
    list->size++;
}
 
/* 打印链表 */
void show_list(List *list) {
    Node *p = list->first->next;
    while (p != list->first) {
        printf("%d->", p->data);
        p = p->next;
    }
    printf("Nul.\n");
}
 
/* 尾部释放一个元素 */
void pop_back(List *list) {
    if (list->size == 0)
return;
    Node *p = list->first;
    while (p->next != list->last)
        p = p->next; //找到尾部节点的上一个节点
    free(list->last); //释放尾部元素
    list->last = p; //p节点赋给尾部节点
    list->last->next = list->first; //再使链表指向头节点
    list->size--;
}
 
/* 从头释放一个元素 */
void pop_front(List *list) {
    if (list->size == 0)
return;
    Node *p = list->first->next;
    list->first->next = p->next;
    if (list->size == 1) //判断表中是否只有一个元素
        list->last = list->first;
    free(p);
    list->size--;
}
 
/* 由小到大插入元素 */
void insert_val(List *list, ElemType x) {
    Node *p = list->first;
    while (p->next != list->last && p->next->data < x) //轮询找出大于X的元素并在前面插入
        p = p->next;
    if (p->next == list->last && p->next->data < x) //只有一个元素
        push_back(list, x);
    else { //没有元素
        Node *s = _buynode(x);
        s->next = p->next;
        p->next = s;
        list->size++;
    }
}
 
/* 查找链表元素 */
Node* find(List *list, ElemType key) {
    if (list->size == 0) //链表不存在
return NULL;
    if (p == list->first) //链表为空
        return NULL;
 
    Node *p = list->first->next;
    while(p != list->first && p->data != key)
        p = p->next;
 
    return p;
}
 
/* 链表长度 */
int length(List *list) {
    return list->size;
}
 
/* 删除链表元素 */
void delete_val(List *list, ElemType x) {
    if (p == NULL) {
        return;
    }
    if (list->size == 0)
return;
    Node *p = find(list, x); //找出元素
    if (p == list->last) //p为尾节点
        pop_back(list);
    else { //p不为尾节点,删除p
        Node *q = p->next;
        p->next = q->next;
        free(q);
        list->size--;
    }
}
 
/* 对循环单链表进行排序 */--------------?
void sort(List *list) {
    if (list->size == 0 || list->size == 1) //链表长度为0或1不排序
return;
    Node *s = list->first->next; //第一个元素节点
    Node *q = s->next; //第二个元素节点
    list->last->next = NULL; //断开链表连接
    list->last = s;
    list->last->next = list->first;
    while (q != NULL) {
        s = q;
        q = q->next;
        Node *p = list->first;
        while (p->next != list->last && p->next->data < s->data)
            p = p->next;
        if (p->next == list->last &&p->next->data < s->data) {
            list->last->next = s;
            list->last = s;
            list->last->next = list->first;
        }
        else {
            s->next = p->next;
            p->next = s;
        }
    }
}
 
/* 链表逆序 */ ---------------->
void reverse(List *list) {
    if (list->size == 0 || list->size == 1) //没有元素或单个元素则忽略
return;
    Node *p = list->first->next;
    Node *q = p->next;
    list->last->next = NULL;
    list->last = p;
    list->last->next = list->first;
    while (q != NULL) {
        p = q;
        q = q->next;
        p->next = list->first->next;
        list->first->next = p;
    }
}
 
/* 释放链表所有元素 */
void clear(List *list) {
    Node *p = list->first->next;
    while (p != list->first) {
        list->first->next = p->next;
        free(p);
        p = list->first->next;
    }
    list->last = list->first;
    list->last->next = list->first;
    list->size = 0;
}
 
/* 摧毁链表 */
void destroy(List *list) {
    clear(list);
    free(list->first);
    list->first = list->last = NULL;
}
 
/********************************************************
* main函数
/********************************************************/
#include"SClist.h"
 
void main() {
    List mylist;
    InitSClist(&mylist);
 
    ElemType item;
    Node *p = NULL;
    int select = 1;
    while (select) {
        printf("*******************************************\n");
        printf("*[1]  push_back        [2]  push_front    *\n");
        printf("*[3]  show_list           [4]  pop_back      *\n");
        printf("*[5]  pop_front          [6]  insert_val    *\n");
        printf("*[7]  find                    [8]  length        *\n");
        printf("*[9]  delete_val         [10] sort          *\n");
        printf("*[11] reverse             [12] clear         *\n");
        printf("*[13*] destroy             [0]  quit_system   *\n");
        printf("*******************************************\n");
        printf("请选择:>>");
        scanf("%d", &select);
        if (select == 0) break;
        switch (select) {
        case 1:
            printf("请输入要插入的数据(-1结束):>");
            while ( scanf("%d", &item) && ( item != -1) ){
                push_back(&mylist, item);
            }
            break;
        case 2:
            printf("请输入要插入的数据(-1结束):>");
            while ( scanf("%d", &item) && ( item != -1) ){
                push_front(&mylist, item);
            }
            break;
        case 3:
            show_list(&mylist);
            break;
        case 4:
            pop_back(&mylist);
            break;
        case 5:
            pop_front(&mylist);
            break;
        case 6:
            printf("请输入要插入的数据:>");
            scanf("%d", &item);
            insert_val(&mylist, item);
            break;
        case 7:
            printf("请输入要查找的数据:>");
            scanf("%d", &item);
            p = find(&mylist, item);
            if (p == NULL)
                printf("要查找的数据在单链表中不存在!\n");
            break;
        case 8:
            printf("单链表的长度为%d\n", length(&mylist));
            break;
        case 9:
            printf("请输入要删除的值:>");
            scanf("%d", &item);
            delete_val(&mylist, item);
            break;
        case 10:
            sort(&mylist);
            break;
        case 11:
            reverse(&mylist);
            break;
        case 12:
            clear(&mylist);
            break;
            //case 13: //推出再释放
            //destroy(&mylist);
            //break;
        default:
            printf("选择错误,请重新选择!\n");
            break;
        }
    }
    destroy(&mylist);
}
 
 

循环单链表实现

标签:ast   结构体   atm   ret   创建   sizeof   0ms   imsi   join   

原文地址:https://www.cnblogs.com/ownDefine/p/10802087.html

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