不知道我的这个杨辉三角的空间复杂度是多少呢？

#include<stdio.h>
#define N 13
int main(void)
{
        int a[N][N];
        int i,j,n;
        do
        {
                system("cls");
                printf("请输入杨辉三角的层数(为了保持队列整齐，所以请输入3~13的整数）：\n");
                scanf("%d",&n);
                puts("");
                if(n<3||n>13)
                {
                        printf("您输入的数字超出范围，请重新输入。\n");
                        sleep(1);
                }
        }
        while(n<3||n>13);
        for(i=0;i<n;++i)
                for(j=0;j<=i;++j)
                {
                        if(i==j||j==0)
                                a[i][j]=1;
                        else
                                a[i][j]=a[i-1][j-1]+a[i-1][j];
                }

        for(i=0;i<n;++i)
        {
                for(j=0;j<12-i;++j)
                        printf("   ");
                for(j=0;j<=i;++j)
                        printf("%6d",a[i][j]);
                puts("");
        }

        getch();
}