Aujourd'hui, il faut calculer la surface extérieur d'un ensemble de cube.
--- Day 18: Boiling Boulders ---
You and the elephants finally reach fresh air. You've emerged near the base of a large volcano that seems to be actively erupting! Fortunately, the lava seems to be flowing away from you and toward the ocean.
Bits of lava are still being ejected toward you, so you're sheltering in the cavern exit a little longer. Outside the cave, you can see the (…)