foo.cc: In function 'int main()':
foo.cc:10:9: warning: unused variable 'ans' [-Wunused-variable]
     int ans;
         ^~~

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

{"receive":"2020-07-24T07:43:22.070Z","handle":"2020-07-24T07:43:22.070Z","cache_start":"2020-07-24T07:43:22.076Z","read_cases":"2020-07-24T07:43:22.227Z","judge":"2020-07-24T07:43:22.230Z","done":"2020-07-24T07:43:23.330Z"}