I must be missing something, but I don't understand how in the problem D the rules are restated from
Whenever any two models share a row or column, at least one of the two must be a +. Whenever any two models share a diagonal of the grid, at least one of the two must be an x. to: The + models are bishops. Two bishops may not occupy the same diagonal. The x models are rooks. Two rooks may not occupy the same row or column. The o pieces are queens. Two queens may not occupy the same row, column, or diagonal. Moreover, a queen and a bishop may not occupy the same diagonal; a queen and a rook may not occupy the same row or column. -- You received this message because you are subscribed to the Google Groups "Google Code Jam" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-code+unsubscr...@googlegroups.com. To post to this group, send email to google-code@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/google-code/2e67a7fb-95f9-4d85-9bd5-c48b5bebb758%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.