I guess the OP meant to say that you should not use things like sort, map, grep or List::Util. The code in the OP is using the modulo operator, so we should assume this is allowed.

In reply to Re^2: John Guttag's book - 2nd exercise. My attempt in Perl. by Laurent_R
in thread John Guttag's book - 2nd exercise. My attempt in Perl. by pritesh_ugrankar

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