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we have [a] field N by N [with] (N²-1)/2 red tiles and N²/2 blue tiles.
N
(N²-1)/2
N²/2
So, for N=3 we have a field 3 by 3 - that's 9 tiles total - with 4 red tiles and 4½ blue tiles, good. What color is the last half tile?
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Project Euler #244: Sliders
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So, for N=3 we have a field 3 by 3 - that's 9 tiles total - with 4 red tiles and 4½ blue tiles, good. What color is the last half tile?