LED, have ANODE and CATHODE
ANODE = POSITIVE, CATHODE = NEGATIVE.
Resistors ?, I assume from single line you mean RECTIFIER DIODES ?, if so the line depends on which way you want current to flow/not flow.
If flows easy through the line nearest but not the other way.
Resistor orientation is unimportant as they don't have one, they work either way.
tabetha