foo.cc: In function 'int main()':
foo.cc:24:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&s);
  ~~~~~^~~~~~~~~~~~~~
foo.cc:26:8: 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":"2020-07-10T06:06:56.967Z","handle":"2020-07-10T06:06:56.967Z","cache_start":"2020-07-10T06:06:56.977Z","read_cases":"2020-07-10T06:06:57.086Z","judge":"2020-07-10T06:06:57.087Z","done":"2020-07-10T06:06:59.011Z"}