foo.cc: In function 'int main()':
foo.cc:9:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld %lld",&n,&m);
  ~~~~~^~~~~~~~~~~~~~~~~~~
foo.cc:10:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld %lld %lld",&a,&b,&c);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:11:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld %lld %lld",&a,&b,&c);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:12:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld %lld %lld",&a,&b,&c);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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

{"receive":"2020-07-26T11:39:33.303Z","handle":"2020-07-26T11:39:33.303Z","cache_start":"2020-07-26T11:39:33.310Z","read_cases":"2020-07-26T11:39:33.415Z","judge":"2020-07-26T11:39:33.415Z","done":"2020-07-26T11:39:33.780Z"}