Chess Board Puzzle
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Given a chess board of N * N, we have to put only rooks on chess board we wants to place some rooks on the chessboard in such a way that the following conditions are satisfied:
 Each square of the board contains at most one rook.
 There are no four rooks forming a rectangle.
 Formally, there should not be any four valid integers r1,c1, r2, c2 (r1≠r2,c1≠c2) such that there are rooks on squares (r1,c1), (r1,c2), (r2,c1) and (r2,c2)
 The number of rooks is at least 8N
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