A Guarded Field

Logic Level 3

Dimitri places the maximum possible number of Rooks on a 100×100100\times 100 chessboard in such a way that there's no two Rooks that attack each other. How many squares are under attack?

Note: A Rook does not attack the square on which it is.

Mateo Matijasevick by Mateo Matijasevick
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