Outline by rst76

main=interact$f.map(' ':).lines
f x=maximum[' ':y>>" "|y<-x]!x
m!x=do y<-(m>>"#"):m:x++m:[m>>"#"];'#':zipWith max(y++m)m++"#\n"

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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