foo.cc: In function 'int main()':
foo.cc:40:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n) ; scanf("%d", &m) ;
  ~~~~~^~~~~~~~~~
foo.cc:40:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n) ; scanf("%d", &m) ;
                    ~~~~~^~~~~~~~~~
foo.cc:42:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   int a, b, c ; scanf("%d%d%d", &a, &b, &c) ;
                 ~~~~~^~~~~~~~~~~~~~~~~~~~~~

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

{"receive":"2020-06-14T12:00:35.310Z","handle":"2020-06-14T12:00:35.310Z","cache_start":"2020-06-14T12:00:35.317Z","read_cases":"2020-06-14T12:00:35.437Z","judge":"2020-06-14T12:00:35.440Z","done":"2020-06-14T12:00:37.175Z"}