MathForces: Math Olympiads
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Author: mathforces
Problem has been solved: 3 times

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4 corner squares $ 100 \times 100 $ were cut from the checkered board $ 300 \times 300 $. Then the squares of the resulting board were painted in blue and red so that no square $ 2 \times 2 $ is painted in a checkerboard pattern. Find the maximum number of pairs of adjacent squares of different color.

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