Separating edges
Each square of a square grid is colored in one of the three colors: red, yellow or blue, such that the number of squares of each color is the same. If two squares sharing a common edge are in different colors, call that common edge a separating edge. Find the minimal number of separating edges in the grid.
The answer is 56.
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1 solution
Answer
= 33 + 22 + 1
= 33 + (11 + 1 + 11)
= 56