/in/foo.cc: In function 'int main()':
/in/foo.cc:11:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(s.find("reio")==-1)continue;
      ~~~~~~~~~~~~~~^~~~
/in/foo.cc:17:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<t.length();i++){
               ~^~~~~~~~~~~
/in/foo.cc:20:8: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    if(i<t.length()-1&&s[i]=='r'&&s[i+1]=='p')rp++;
       ~^~~~~~~~~~~~~