3 ms·
spoiler for how to prove it: think of colors of chessboard (black/white alternating) and what colors a domino piece will always cover.
by blueplanet200 5y ago
spoiler for how to prove it:
think of colors of chessboard (black/white alternating) and what colors a domino piece will always cover.
- SamBam 5y agoNice. I was confused by the L-shaped shading in the top-right corner of the diagram, though.