无头双链表排序

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（1）无头头插双链表排序

（思路：在原链表中逐个比较大小，将最小的插入新的链表（插入顺序按照尾插的顺序））

#include <stdio.h>#include <stdlib.h>typedef struct person{    int age;    struct person *pre;    struct person *next;}per;per *head_list(per *one, int num)   //头插{    per *temp = (per *)malloc(sizeof(per));    temp->age = num;    temp->pre = NULL;    if(one)    {        one->pre = temp;        temp->next = one;    }    return temp;}void show(per *head){    if(NULL == head)    {        return;    }    per *t = NULL;    while(head)    {        t = head;        printf("age is %d\n",head->age);        head = head->next;    }    printf("=======================\n");    while(t)    {        printf("age is %d\n",t->age);        t = t->pre;    }}void *sort(per *head)   //排序{    if(NULL == head)    {        return;    }    if(NULL == head->next)    {        printf("min is head\n");    }    per *min = head;    per *tmp = head;    per *new_list = NULL;    per *tail_sort = NULL;    while(head)    {        min = head;        tmp = head;        while(tmp->next)        {            if(min->age > tmp->next->age)            {                min = tmp->next;                min->pre = tmp;            }            tmp = tmp->next;        }        if(min == head)        {            head = head->next;        }        else            if(NULL == min->next)   //如果最小的是最后一个            {                min->pre->next = NULL;            }            else            {                min->pre->next = min->next;                min->next->pre = min->pre;            }//按尾插顺序组成新链表        min->pre = NULL;                min->next = NULL;        if(NULL == new_list)        {            tail_sort = min;            new_list = tail_sort;        }        else        {            tail_sort->next = min;            min->pre = tail_sort;            tail_sort = min;        }    }    return new_list;}int main(){    int i = 0;    per *head = NULL;    while(i++ < 6)    {        head = head_list(head,rand () % 100);   //rand() 伪随机函数，产生100以内的随机数    }    show(head);    printf("=========after sort==========\n");    head = sort(head);    show(head);    return 0;}

（2）无头尾插双链表排序

（思路：在原链表中逐个比较大小，将最小的插入新的链表（插入顺序按照头插的顺序））

#include <stdio.h>#include <stdlib.h>typedef struct person{    int age;    struct person *pre;    struct person *next;}per;per *tail_list(per *one, int num)   //尾插{    per *temp = (per *)malloc(sizeof(per));    temp->age = num;    if(NULL == one)    {        return temp;    }    per *head = one;    per *t = one;    while(one->next)    {        t = one->next;        one = one->next;    }    one->next = temp;    temp->pre = t;    return head;}void show(per *head){    if(NULL == head)    {        return;    }    per *t = NULL;    while(head)    {        t = head;        printf("age is %d\n",head->age);        head = head->next;    }    printf("==========================\n");    while(t)    {        printf("age is %d\n",t->age);        t = t->pre;    }}void *sort(per *head)       //排序{    if(NULL == head)    {        return;    }    if(NULL == head->next)    {        printf("min is head\n");        return;    }    per *min = head;    per *tmp = head;    per *new_list = NULL;    while(head)    {        min = head;        tmp = head;        while(tmp->next)        {            if(min->age > tmp->next->age)            {                min = tmp->next;                min->pre = tmp;            }            tmp = tmp->next;        }        if(min == head)        {            head = head->next;        }        else             if(NULL == min->next)            {                min->pre->next = NULL;            }            else            {                min->pre->next = min->next;                min->next->pre = min->pre;            }//按头插顺序组成新新链表        min->pre = NULL;        min->next = new_list;        if(NULL != new_list)        {            new_list->pre = min;        }        new_list = min;    }    return new_list;}int main(){    int i = 0;    per *head = NULL;    while(i++ < 6)    {        head = tail_list(head,rand() % 100);    //rand() 伪随机数函数，生成100以内的随机数    }    show(head);    printf("=======after sort========\n");    head = sort(head);    show(head);    return 0;}

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