my code is running for cases 0-4. please explain the problem

include

include

include

include

int main() {

int n,i,j,k,a=0;
scanf("%d", &n);

k=n;
int arr[100][100];
int cc=0;


do
{
for(i=cc;i<2*n-cc-1;i++)
  { 
    for(j=cc;j<2*n-cc-1;j++)
    { 
    if(i==a||j==a||i==n*2-a-2||j==n*2-a-2)
      arr[i][j]=k;
    }
  }
  cc++;
 k--;
 a++;
 }while(k>0);
 for(i=0;i<n*2-1;i++)
 {
 for(j=0;j<n*2-1;j++)
 {
 printf("%d ",arr[i][j]);
 }
 printf("\n");
 }



}