链表

模板

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
typedef struct node
{
    int id;
    int score;
    int num;
    struct node *next;
} STU;

STU *pp=NULL;

STU *Creat();
void Print(STU *head);
void Find(STU *head, int num);
STU *Delete(STU *head, int num);
void Clear(STU *head);
STU *Insert(STU *head, int id, int score);

int main()
{

    int num, id, score;
    char s[10];
    pp=Creat();//建立链表
    while(~scanf("%s", s))
    {
        if(!strcmp(s,"print")) Print(pp);//输出（查找）链表
        else if(!strcmp(s,"find"))
        {
            scanf("%d", &num);
            Find(pp, num);//查询
        }
        else if(!strcmp(s,"delete"))
        {
            scanf("%d", &num);
            pp=Delete(pp, num);//删除
        }
        else if(!strcmp(s,"insert"))
        {
            scanf("%d%d", &id, &score);
            pp=Insert(pp, id, score);//插入
        }
        else if(!strcmp(s,"clear"))
        {
            Clear(pp);//清空
        }
    }
    return 0;
}

STU *Creat()
{
    STU *head=NULL, *p1, *p2;
    p1=p2=(STU *)malloc(sizeof(STU));
    scanf("%d%d", &p2->id, &p2->score);

    while(p2->id!=0)
    {
        if(head==NULL) head=p1;
        else p1->next=p2;
        p1=p2;
        p2=(STU *)malloc(sizeof(STU));
        scanf("%d%d", &p2->id, &p2->score);
    }
    if（head！=NULL）p1->next=NULL;
    return head;
}

void Print(STU *head)
{
    STU *p;
    for(p=head; p; p=p->next)
        printf("Id:%d Score:%d\n", p->id, p->score);
}

void Find(STU *head, int num)
{
    STU *p;
    int isFind=1;
    for(p=head; p; p=p->next)
    {
        if(p->id==num)
        {
            isFind=0;
            printf("Score:%d\n", p->score);
            break;
        }
    }
    if(isFind)
        printf("Not exist!\n");
}

STU *Delete(STU *head, int num)
{
    STU *p, *q=NULL;
    int isFind=1;
    for(p=head; p; q=p, p=p->next)
    {
        if(p->id==num)
        {
            isFind=0;
            if(!q) head=p->next;
            else q->next=p->next;
            free(p);
            break;
        }
    }
    if(isFind)
        printf("Not exist!\n");
    return head;
}

void Clear(STU *head)
{
    STU *p, *q;
    for(p=head; p; p=q)
    {
        q=p->next;
        free(p);
    }
}

STU *Insert(STU *head, int Id, int Score)
{
    STU *p, *q=NULL, *New;
    New=(STU *)malloc(sizeof(STU));
    New->id=Id;
    New->score=Score;
    if(head==NULL)
    {
        head=New;
        New->next=NULL;
    }
    else
    {
        for(p=head; p; q=p, p=p->next)
        {
            if(!q && New->id < p->id)
            {
                New->next=p;
                head=New;
                break;
            }
            else if(New->id < p->id  && New->id > q->id)
            {
                New->next=p;
                q->next=New;
                break;
            }
            else if(New->id > p->id && !p->next)
            {
                New->next=NULL;
                p->next=New;
                break;
            }
        }
    }
    return head;
}

多次删除

struct link *delodd(struct link *head)
{
    struct link *p=NULL, *q=NULL, *clear=NULL;
    for(p=head; p; )
    {
        if(p->data%2)
        {
            clear=p;
            if(!q)
            {
                head=p->next;
                p=head;
            }
            else
            {
                q->next=p->next;
                p=q->next;
            }
            free(clear);
        }
        else
        {
            q=p;
            p=p->next;
        }
    }
    return head;
}

逆序（反向）链表

struct Link* reverseLink(struct Link *Head)
{
    struct Link *p1, *p2, *t=Head;
    p2=Head->next;
    t->next=NULL;
    while(p2)
    {
        p1=p2;
        p2=p2->next;
        p1->next=t;
        t=p1;
    }
    return t;
};