foo.cc: In function 'int main()':
foo.cc:11:13: warning: iteration 89999998u invokes undefined behavior [-Waggressive-loop-optimizations]
   if(!mark[i]){
             ^
foo.cc:10:24: note: containing loop
  for(register int i=2;i<=size;i++){
                        ^

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

{"receive":"2020-04-03T01:34:29.915Z","handle":"2020-04-03T01:34:29.916Z","done":"2020-04-03T01:34:33.146Z"}