Nice twist++. Took me a while to work out why i doesn't destroy the input array. Not sure that I share your distaste for the index variable...'sides...mine's quicker:).
You have a typo? ... an out-by-one error on your version of mapnz, it produces one too many rows. You either need to subtract 1 as you do in the mapn version or start your range from 1.
Examine what is said, not who speaks.
1) When a distinguished but elderly scientist states that something is possible, he is almost certainly right. When he states that something is impossible, he is very probably wrong.
2) The only way of discovering the limits of the possible is to venture a little way past them into the impossible
3) Any sufficiently advanced technology is indistinguishable from magic.
Arthur C. Clarke.
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