/in/foo.cc: In function 'bool isSimilar(std::__cxx11::string, std::__cxx11::string)':
/in/foo.cc:9:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<A.size();i++)
               ~^~~~~~~~~
/in/foo.cc:14:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<B.size();i++)//穷举短串 
               ~^~~~~~~~~