foo.cc: In function 'int main()':
foo.cc:8:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i=0; i<s1.size(); i++) a1*=(s1[i]-'A'+1);
                ~^~~~~~~~~~
foo.cc:9:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i=0; i<s2.size(); i++) a2*=(s2[i]-'A'+1);
                ~^~~~~~~~~~

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

{"receive":"2020-08-10T03:25:33.759Z","handle":"2020-08-10T03:25:33.759Z","cache_start":"2020-08-10T03:25:33.768Z","read_cases":"2020-08-10T03:25:33.887Z","judge":"2020-08-10T03:25:33.890Z","done":"2020-08-10T03:25:34.949Z"}