14 lines
245 B
Perl
14 lines
245 B
Perl
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use 5.20.0;
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use warnings;
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use Path::Tiny;
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my @expenses = path('input')->lines;
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while(my $this = shift @expenses) {
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my $that = 2020 - $this;
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next unless grep { $_ == $that } @expenses;
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print join " ", $this, $that, $this*$that;
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}
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