As far as I can tell this question was cross-posted to StackExchange*, where the source of this problem was cited as HackerEarth. Cross-posting is considered acceptable as long as you inform readers, so that efforts are not duplicated.

Update: * The link above has now gone dead. The one posted in a reply below is currently still good: http://stackoverflow.com/questions/42733000/code-golf-in-perl

In reply to Re: Golf code in perl by haukex
in thread Golf code in perl by tt08

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