foo.cc: In function 'int main()':
foo.cc:14:13: warning: 'sum' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout << sum;
             ^

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

{"receive":"2020-04-17T06:16:06.090Z","handle":"2020-04-17T06:16:06.091Z","done":"2020-04-17T06:16:06.904Z"}