foo.cc:2:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){register int a,b;scanf("%d%d",&a,&b);printf("%d",a+b);}
      ^
foo.cc: In function 'int main()':
foo.cc:2:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 main(){register int a,b;scanf("%d%d",&a,&b);printf("%d",a+b);}
                         ~~~~~^~~~~~~~~~~~~~

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

{"receive":"2020-08-08T14:55:44.939Z","handle":"2020-08-08T14:55:44.939Z","cache_start":"2020-08-08T14:55:44.969Z","read_cases":"2020-08-08T14:55:45.088Z","judge":"2020-08-08T14:55:45.089Z","done":"2020-08-08T14:55:45.494Z"}