/in/foo.cc: In member function 'int my_set::find_set(unsigned int)':
/in/foo.cc:22:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if (x > size)
             ~~^~~~~~
/in/foo.cc: In member function 'void my_set::union_set(unsigned int, unsigned int)':
/in/foo.cc:27:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if (x > size || y > size)
             ~~^~~~~~
/in/foo.cc:27:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if (x > size || y > size)
                         ~~^~~~~~