میشه اینو با رنگ آمیزی حل کرد؟! :-؟
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At.B
Jan 6, 2010, 2:22:53 PM1/6/10
to Mashads Farzanegan IOI
10x20 board is covered by domino tiles so that they don't have common
points (even vertices).
Prove that the rest of the board can be covered with domino tiles so
that every cell will be covered by exactly one tile
points (even vertices).
Prove that the rest of the board can be covered with domino tiles so
that every cell will be covered by exactly one tile
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