/in/foo.cc: In constructor 'graph::graph(int)':
/in/foo.cc:44:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (j = 0; j < point.size(); j++)
               ~~^~~~~~~~~~~~~~
/in/foo.cc:49:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if (j == point.size())
       ~~^~~~~~~~~~~~~~~
/in/foo.cc:53:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (j = 0; j < point.size(); j++)
               ~~^~~~~~~~~~~~~~
/in/foo.cc:58:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if (j == point.size())
       ~~^~~~~~~~~~~~~~~