/*我们的计量方式，除下标从0开始外，其余都从1开始算，所以只有在涉及访问数组的时候，要注意是否要+1 或-1*/
#include <stdio.h>

#define MAXSIZE 20
#define OK 1
#define ERROR 0
#define TRUE 1
#define FLASE 0

typedef struct
{
 int No;
 int grade;
} ElemType;

typedef struct
{
 ElemType data[MAXSIZE];//the max length of the list
 int length;
}SqList;

void InitList(SqList* L)
{
 L->length = 0;
}

int GetElem(SqList* L,int i,ElemType* e)
{
 if(L->length == 0 || i > L->length || i < 1)
  return ERROR;
 *e = L->data[i-1];
 return OK;
	
}
int CreatList(SqList* L)
{
 int i;
 printf("ready to create the list,please input the length\n");
 scanf("%d",&L->length);
 if(L->length > MAXSIZE)
  fprintf(stderr,"out of memory!\n");
 for(i = 0; i <= L->length - 1;i++)
 {
  printf("data %d=   ",i+1);
  scanf("%d %d",&L->data[i].No,&L->data[i].grade);
 }
}

int InsertList(SqList*L,int i,ElemType* e)
{ 
 int k;
 if(L->length == MAXSIZE)
  return ERROR;
 if(i < 1 || i > L->length + 1)
  return ERROR;
 if(i <= L->length)
 {
  for(k = L->length; k >= i; k--)
  {
   L->data[k] = L->data[k - 1];
  }
 }
 L->data[i - 1] = *e;
 L->length++;
	
 return OK;
}

int DeleteList(SqList* L,int i)
{
 int k;
 if(L == NULL || i > L->length)
  return ERROR;
 for(k = i; k <= L->length;k++ )
 {
  L->data[k - 1] = L->data[k];
 }
 L->length --;
	
 return OK;
}

void ShowList(SqList* L)
{
 int i;
 for(i = 0; i <= L->length - 1;i++)
 {
  printf("%d %d \n",L->data[i].No,L->data[i].grade);
 }
}

int ListLength(SqList* L)
{
 return L->length;
}

/*return the location(num) of the element*/
int LocateElem(SqList* L,ElemType* e)
{
 int i,res;
 for(i = 0; i < L->length; i++)
 {
  if(L->data[i].No == e->No && L->data[i].grade == e->grade)
   res = i+1;
  else
   res = -1;
 }
 return res;

}

/*combine two lists,if the element in l2 is not existent in l1,insert the element into l1*/
void CombineList(SqList* L1,SqList* L2)
{
 int L1_len,L2_len,i;
 ElemType e;
 L1_len = ListLength(L1);
 L2_len = ListLength(L2); 
	
 for(i = 1; i <= L2_len;i++)
 {
  GetElem(L2,i,&e);
  if(LocateElem(L1,&e) == -1)
  {
   InsertList(L1,i,&e);
  }
 }
}

int main()
{
 SqList L1;
 SqList L2;
 InitList(&L1);
 InitList(&L2);
	
 printf("SqList L1:\n");
 CreatList(&L1);
 printf("SqList L2:\n");
 CreatList(&L2);
 CombineList(&L1,&L2);
 ShowList(&L1);
 return 0;
}