#include<stdio.h>
#include<malloc.h>

#define ERROR 0
#define OK 1
#define EQUAL 1
#define OVERFLOW -1
#define LIST_INIT_SIZE 100
#define LISTINCREMENT 10

struct STU{
 char name[20];
 char stuno[10];
 int age;
 int score;
}stu[50];
typedef struct STU ElemType;

struct LNODE
{
 ElemType data;
 struct LNODE *next;
};

typedef struct LNODE LNode;
typedef struct LNODE *LinkList;


int init(LinkList *L)
{
 *L=(LNode *)malloc(sizeof(LNode));
 if(!L)
 	exit(ERROR);
 memset(&((*L)->data), 0, sizeof(struct STU));
 (*L)->next=NULL;
 return OK;
}/*init */

int ListLength(LinkList L)
{
 int j=0;
 while (L->next)
 {
 L=L->next;
 j++;
 }
 return j;
}

int GetElem(LinkList L,int i,ElemType *e)
{
 LinkList p; int j;
 p=L->next;
 j=1;
 while(p&&j<i){
 	p=p->next;
	++j;
 }
 if(!p||j>1) return ERROR;
 *e=p->data;
 return OK;
}

int EqualList(ElemType *e1,ElemType *e2)
{
 if (strcmp(e1->name,e2->name)==0)
   return 1;
 else
   return 0;
}

int Less_EqualList(ElemType *e1,ElemType *e2)
{
 if (strcmp(e1->name,e2->name)<=0)
   return 1;
 else
   return 0;
}
int LocateElem(LinkList La,ElemType e,int type)
{
 int i;
 LinkList p;
 p=La;
 switch (type)
 {
 case EQUAL:
 while(p->next)
 {
 p=p->next;
 if(EqualList(&p->data,&e))
 return 1;
 }
 return 0;
break;
 default:
break;
 }
 return 0;
}

void MergeList(LinkList La,LinkList Lb,LinkList *Lc)
{
 LinkList pa,pb,pc;
 pa=La->next;pb=Lb->next;
 *Lc=pc=La;
 while(pa && pb)
 {
 if(Less_EqualList(&pa->data,&pb->data))
{
 pc->next=pa;pc=pa;pa=pa->next;
}
 else
{
 pc->next=pb;pc=pb;pb=pb->next;
}
}
 pc->next=pa?pa:pb;
 free(Lb);
}

int printlist(LinkList L)
{
 int i;
 LinkList p;
 p=L;
 printf("name    stuno     age     score\n");
 while(p->next)
 {
 p=p->next;
 printf("%-10s %s\t%d\t%d\n", p->data.name, p->data.stuno, p->data.age, p->data.score);
 }
 printf("\n");
}

int ListInsert(LinkList L,int i,ElemType e)
{
 LinkList p,s;
 int j;
 p=L;j=0;
 while(p&&j<i-1)
 {
 p=p->next;
 ++j;
 }
 if(!p||j>i-1) return ERROR;
 s=(LinkList)malloc(sizeof(LNode));
 s->data=e;
 s->next=p->next;
 p->next=s;
 return OK;
}/*ListInsert Before i */


main()
{
 struct STU e;
 LinkList La,Lb,Lc;


 printf("\n\n-------------------List Demo is running...----------------\n\n");
 printf("First is InsertList function.\n");
 init(&La);

 strcpy(e.name,"stu1");
 strcpy(e.stuno,"100001");
 e.age=80;
 e.score=1000;
 ListInsert(La,1,e);
 strcpy(e.name,"stu3");
 strcpy(e.stuno,"100002");
 e.age=80;
 e.score=1000;
 ListInsert(La,2,e);
 printlist(La);
 getchar();

 strcpy(e.name,"stu5");
 strcpy(e.stuno,"100003");
e.age=80;
 e.score=1000;
 ListInsert(La,3,e);
 printlist(La);
 getchar();

 init(&Lb);
 strcpy(e.name,"stu2");
 strcpy(e.stuno,"100001");
 e.age=70;
 e.score=1000;
 ListInsert(Lb,1,e);
 strcpy(e.name,"stu4");
 strcpy(e.stuno,"100002");
 e.age=70;
 e.score=1000;
 ListInsert(Lb,2,e);

strcpy(e.name,"stu6");
 strcpy(e.stuno,"100001");
 e.age=70;
 e.score=1000;
 ListInsert(Lb,3,e);
 printlist(Lb);
 getchar();

 MergeList(La,Lb,&Lc);
 printlist(Lc);
 getchar();
}