/in/foo.cc: In function 'int main()':
/in/foo.cc:69:10: warning: '_pZ' may be used uninitialized in this function [-Wmaybe-uninitialized]
  que.push({Hm,_pm,_pz,_pZ,0});
  ~~~~~~~~^~~~~~~~~~~~~~~~~~~~
/in/foo.cc:69:10: warning: '_pz' may be used uninitialized in this function [-Wmaybe-uninitialized]
/in/foo.cc:69:10: warning: '_pm' may be used uninitialized in this function [-Wmaybe-uninitialized]