foo.cc: In function 'int main()':
foo.cc:27:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s", s);
  ~~~~~^~~~~~~~~
foo.cc:55:8: warning: ignoring return value of 'int system(const char*)', declared with attribute warn_unused_result [-Wunused-result]
  system("pause");
  ~~~~~~^~~~~~~~~

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

{"receive":"2020-08-06T06:02:14.606Z","handle":"2020-08-06T06:02:14.607Z","cache_start":"2020-08-06T06:02:14.685Z","read_cases":"2020-08-06T06:02:14.914Z","judge":"2020-08-06T06:02:14.918Z","done":"2020-08-06T06:02:18.314Z"}