foo.cc: In function 'int main()':
foo.cc:59:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&k);
  ~~~~~^~~~~~~~~~~~~~
foo.cc:64:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&fw);
   ~~~~~^~~~~~~~~~

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

{"receive":"2020-07-24T00:48:09.209Z","handle":"2020-07-24T00:48:09.209Z","cache_start":"2020-07-24T00:48:09.216Z","read_cases":"2020-07-24T00:48:09.326Z","judge":"2020-07-24T00:48:09.326Z","done":"2020-07-24T00:48:10.699Z"}