/in/foo.cc: In function 'int main()':
/in/foo.cc:14:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0; i<s.size(); i++){
               ~^~~~~~~~~
/in/foo.cc:11:12: warning: unused variable 'ta1' [-Wunused-variable]
  int tc1=0,ta1=0, tt1=0;
            ^~~