foo.cc: In function 'int main()':
foo.cc:53:6: warning: unused variable 'ans' [-Wunused-variable]
  int ans=0;
      ^~~

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

正在同步测试数据，请稍后
{"receive":"2020-08-10T03:30:25.127Z","handle":"2020-08-10T03:30:25.127Z","cache_start":"2020-08-10T03:30:25.135Z","read_cases":"2020-08-10T03:30:25.511Z","judge":"2020-08-10T03:30:25.512Z","done":"2020-08-10T03:30:26.637Z"}