One rook is placed in some unit squares of a 100 × 100 chessboard. Castles in...

One rook is placed in some unit squares of a 100 × 100 chessboard. Castles in the same row or in the same column, with no other castles threaten each other. Regardless of the number and location of the castles, if any two castles that threaten each other can be in different colors, what is the smallest value of the number n that can always be painted in one of n colors?

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orchestra answered 1 year ago

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