foo.cc: In function 'void Process(int)':
foo.cc:88:16: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(isdigit(L) && islower(R) || isdigit(R) && islower(L)) return;
     ~~~~~~~~~~~^~~~~~~~~~~~~
foo.cc:97:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0; i<fill.size(); i++) 
                ~^~~~~~~~~~~~
foo.cc:102:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0; i<fill.size(); i++) 
                ~^~~~~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:127:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while( s[k]!='-' && k<s.size() ) k++; 
                       ~^~~~~~~~~
foo.cc:128:7: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(k>=s.size()) break;
      ~^~~~~~~~~~

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