In a 5x5 chessboard with a queen of one color (white, say) on the perimeter, one can place 12 black queens on the board such that none of the black queens can attack the white one (or vice versa).
Write a function that returns the number of queens that cannot attack a queen of the other color placed anywhere on the perimeter of an nxn chessboard.
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Last Solution submitted on May 24, 2026

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