foo.c: In function 'main':
foo.c:11:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ^~~~~~~~~~~~~~
foo.c:16:4: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d",&a[i][j]);
    ^~~~~~~~~~~~~~~~~~~~

自豪的采用 HydroJudge 进行评测(github.com/hydro-dev/HydroJudge)

{"receive":"2020-08-10T04:46:09.032Z","handle":"2020-08-10T04:46:09.032Z","cache_start":"2020-08-10T04:46:09.042Z","read_cases":"2020-08-10T04:46:09.150Z","judge":"2020-08-10T04:46:09.151Z","done":"2020-08-10T04:46:09.628Z"}