比较线性表的大小

#include<stdio.h>
#include<stdlib.h>
#include<string.h> 
#define MAXSIZE 100
typedef int DataType;
typedef struct 
{
     DataType data[MAXSIZE];
     int last;
}seqlist;
seqlist *Creat_seqlist()
{
    int n;
    seqlist *L;
    L=(seqlist *)malloc(sizeof(seqlist));
    L->last=-1;
    printf("请输入创建的线性表的数据元素的个数：\n");
    scanf("%d",&n);
    for(int i=0;i<n;i++)
    {
         printf("请输入第%d个数据元素的值：\n",i+1);
         scanf("%d",&L->data[i]);
    }
    L->last=n-1;
    return L;
}
int cmp(seqlist *a,seqlist *b)
{
     seqlist *na,*nb;
     na=(seqlist *)malloc(sizeof(seqlist));
     na->last=-1;
     nb=(seqlist *)malloc(sizeof(seqlist));
     nb->last=-1;
     int i=0;
     while(i<=a->last&&i<=b->last&&a->data[i]==b->data[i])
           i++;
     for(int j=i;j<=a->last;j++)
     {
         na->data[j-i]=a->data[j];
         na->last++;
     }
     for(int j=i;j<=b->last;j++)
     {
         nb->data[j-i]=b->data[j];
         nb->last++;
     }
     if(na->last==nb->last&&na->last==-1)
            return 0;
     else
     { 
          if(na->last>-1&&nb->last==-1||na->last>-1&&nb->last>-1&&na->data[0]>nb->data[0])
                return 1;
          else
                return -1;
     }
}
int main()
{
    int n;
    seqlist *A,*B;
    A=Creat_seqlist();
    B=Creat_seqlist();
    n=cmp(A,B);
    if(n==0)
       printf("线性表A==B\n");
    else 
    {
         if(n==1)
              printf("线性表A>B\n");
          else
              printf("线性表A<B\n");
     }
    system("pause");
    return 0;
}