/in/foo.cc: In function 'int main()':
/in/foo.cc:11:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<s.size();cout<<(i<s.size()-1?" ":"\n"),i++)
              ~^~~~~~~~~
/in/foo.cc:11:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<s.size();cout<<(i<s.size()-1?" ":"\n"),i++)
                                ~^~~~~~~~~~~
/in/foo.cc:21:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int j=0;j<s.size();cout<<(j<s.size()-1?" ":"\n"),j++)
              ~^~~~~~~~~
/in/foo.cc:21:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int j=0;j<s.size();cout<<(j<s.size()-1?" ":"\n"),j++)
                                ~^~~~~~~~~~~
/in/foo.cc:31:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<s.size();cout<<(i<s.size()-1?" ":"\n"),i++)
              ~^~~~~~~~~
/in/foo.cc:31:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<s.size();cout<<(i<s.size()-1?" ":"\n"),i++)
                                ~^~~~~~~~~~~
/in/foo.cc:41:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int j=0;j<s.size();cout<<(j<s.size()-1?" ":"\n"),j++)
              ~^~~~~~~~~
/in/foo.cc:41:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int j=0;j<s.size();cout<<(j<s.size()-1?" ":"\n"),j++)
                                ~^~~~~~~~~~~
/in/foo.cc:51:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<s.size();cout<<(i<s.size()-1?" ":"\n"),i++)
              ~^~~~~~~~~
/in/foo.cc:51:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<s.size();cout<<(i<s.size()-1?" ":"\n"),i++)
                                ~^~~~~~~~~~~