foo.cc: In function 'int main()':
foo.cc:18:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(s.size()>5*n){
      ~~~~~~~~^~~~
foo.cc:35:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=1;i<totalS.size();){
              ~^~~~~~~~~~~~~~
foo.cc:11:6: warning: unused variable 'i' [-Wunused-variable]
  int i=0;
      ^

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