/in/foo.cc: In function 'bool ispass(std::__cxx11::string)':
/in/foo.cc:9:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<s.size();i++)
              ~^~~~~~~~~
/in/foo.cc:19:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<apeared.size();i++)
              ~^~~~~~~~~~~~~~~
/in/foo.cc:21:21: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   if(apeared[i]>='a'&&apeared[i]<='z'||apeared[i]>='A'&&apeared[i]<='Z'||apeared[i]>='0'&&apeared[i]<='9')
                      
/in/foo.cc:21:89: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   if(apeared[i]>='a'&&apeared[i]<='z'||apeared[i]>='A'&&apeared[i]<='Z'||apeared[i]>='0'&&apeared[i]<='9')