foo.c: In function 'main':
foo.c:24:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   24 |  scanf("%d\n",&n);
      |  ^~~~~~~~~~~~~~~~
foo.c:26:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   26 |   scanf("%d %d",&a[i],&b[i]);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~
foo.c:34:3: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized]
   34 |  k=k/q;
      |  ~^~~~

[Hydro](https://hydro.ac)提供评测服务