/in/foo.cc: In function 'void pass(int)':
/in/foo.cc:9:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<s[x].size();i++){
               ~^~~~~~~~~~~~
/in/foo.cc:17:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<s[x].size();i++){
               ~^~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:33:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<Ans.size();i++){
              ~^~~~~~~~~~~