/in/foo.cc: In member function 'void Set::Insert(int)':
/in/foo.cc:12:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<v.size();i++)
               ~^~~~~~~~~
/in/foo.cc: In member function 'void Set::Erase(int)':
/in/foo.cc:24:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<v.size();i++)
               ~^~~~~~~~~
/in/foo.cc: In member function 'void Set::Output()':
/in/foo.cc:35:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<v.size();i++)
               ~^~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:115:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<v.v.size();i++)
               ~^~~~~~~~~~~