foo.cc: In function 'int main()':
foo.cc:41:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d",&n,&m1,&m2);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~
foo.cc:47:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&x,&y);
   ~~~~~^~~~~~~~~~~~~~
foo.cc:53:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&x,&y);
   ~~~~~^~~~~~~~~~~~~~

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

{"receive":"2020-07-21T07:24:22.257Z","handle":"2020-07-21T07:24:22.257Z","cache_start":"2020-07-21T07:24:22.264Z","read_cases":"2020-07-21T07:24:22.394Z","judge":"2020-07-21T07:24:22.398Z","done":"2020-07-21T07:24:23.058Z"}