foo.cc: In function 'int main()':
foo.cc:10:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s",a1);
  ~~~~~^~~~~~~~~
foo.cc:11:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s",b1);
  ~~~~~^~~~~~~~~

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

{"receive":"2020-08-06T03:29:39.512Z","handle":"2020-08-06T03:29:39.512Z","cache_start":"2020-08-06T03:29:39.519Z","read_cases":"2020-08-06T03:29:39.694Z","judge":"2020-08-06T03:29:39.694Z","done":"2020-08-06T03:29:41.072Z"}