Editorial for COCI '20 Contest 6 #1 Bold

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We make a new $n \times m$ ~n \times m~ matrix and fill it with .. Then we go through the original matrix, and when we find # on some position $(i, j)$ ~(i, j)~, we put # on positions $(i, j)$ ~(i, j)~, $(i, j+1)$ ~(i, j+1)~, $(i+1, j)$ ~(i+1, j)~ and $(i+1, j+1)$ ~(i+1, j+1)~ in the new matrix.

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