/in/foo.cc: In function 'node cx(int, int, int, int, int)':
/in/foo.cc:50:7: warning: 'ans.node::rx' may be used uninitialized in this function [-Wmaybe-uninitialized]
  node ans;
       ^~~
/in/foo.cc:50:7: warning: '*((void*)& ans +8)' may be used uninitialized in this function [-Wmaybe-uninitialized]
/in/foo.cc:50:7: warning: '*((void*)& ans +4)' may be used uninitialized in this function [-Wmaybe-uninitialized]
/in/foo.cc:50:7: warning: 'ans.node::s' may be used uninitialized in this function [-Wmaybe-uninitialized]