foo.cc: In function 'int main()':
foo.cc:7:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
foo.cc:10:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d", &a[i][j]);
    ~~~~~^~~~~~~~~~~~~~~~

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

{"receive":"2020-06-27T07:49:29.896Z","handle":"2020-06-27T07:49:29.896Z","cache_start":"2020-06-27T07:49:29.907Z","read_cases":"2020-06-27T07:49:30.050Z","judge":"2020-06-27T07:49:30.052Z","done":"2020-06-27T07:49:30.290Z"}