Checkboard

Author: mathforces
Problem has been solved: 3 times

Русский язык | English Language

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.