Editorial for COCI '06 Contest 6 #2 Magija

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The cell $(i, j)$ ~(i, j)~ in the given quarter is copied to three other cells. The coordinates of those cells are (depending on the implementation):

If the upper left cell is $(0, 0)$ ~(0, 0)~, the coordinates are $(2R-i-1, j)$ ~(2R-i-1, j)~, $(i, 2C-j-1)$ ~(i, 2C-j-1)~ and $(2R-i-1, 2C-j-1)$ ~(2R-i-1, 2C-j-1)~.
If the upper left cell is $(1, 1)$ ~(1, 1)~, the coordinates are $(2R-i+1, j)$ ~(2R-i+1, j)~, $(i, 2C-j+1)$ ~(i, 2C-j+1)~ and $(2R-i+1, 2C-j+1)$ ~(2R-i+1, 2C-j+1)~.

After copying the cells we add the error, changing the specified cell.

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