foo.cc: In function 'int main()':
foo.cc:17:17: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
  printf("%d",ans);
                 ^

自豪的采用jd5进行评测(github.com/masnn/jd5)

{"receive":"2020-03-01T12:14:31.666Z","handle":"2020-03-01T12:14:31.666Z","cache_start":"2020-03-01T12:14:31.666Z","read_cases":"2020-03-01T12:14:31.854Z","judge":"2020-03-01T12:14:31.855Z","done":"2020-03-01T12:14:32.177Z"}