foo.c: In function 'main':
foo.c:10:1: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   10 | scanf("%d",&T);
      | ^~~~~~~~~~~~~~
foo.c:13:1: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   13 | scanf("%d",&n);
      | ^~~~~~~~~~~~~~
foo.c:17:1: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   17 | scanf("%d",&a[i][j]);
      | ^~~~~~~~~~~~~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务