adventofcode/2017/day1/day1.pl

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Perl
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2017-12-02 01:28:26 +00:00
#!/usr/bin/env perl -n
use 5.20.0;
use List::AllUtils qw/ sum /;
chomp;
$_ .= substr $_, 0, 1;
say sum /(.)(?=\1)/g;