Main.c:3:5: error: variably modified ‘a’ at file scope
    3 | int a[N],b[N],s;
      |     ^
Main.c:3:10: error: variably modified ‘b’ at file scope
    3 | int a[N],b[N],s;
      |          ^
Main.c: In function ‘main’:
Main.c:26:2: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
   26 |  scanf("%d",&n);
      |  ^~~~~~~~~~~~~~
Main.c:29:3: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
   29 |   scanf("%d",&a[i]);
      |   ^~~~~~~~~~~~~~~~~
Main.c:34:3: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
   34 |   scanf("%d",&b[i]);
      |   ^~~~~~~~~~~~~~~~~