/in/foo.cc: In function 'int main()':
/in/foo.cc:52:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=0; i<leap.size();++i)leap[i].print('\\');
                       ^
/in/foo.cc:55:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=0; i<nleap.size();++i)nleap[i].print('/');
                       ^