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#!/usr/bin/env perl
use strict;
use warnings;
use experimental qw{ say postderef signatures state };
my @examples = (
{
items1 => [ [ 1, 1 ], [ 2, 1 ], [ 3, 2 ] ],
items2 => [ [ 2, 2 ], [ 1, 3 ] ],
},
{
items1 => [ [ 1, 2 ], [ 2, 3 ], [ 1, 3 ], [ 3, 2 ] ],
items2 => [ [ 3, 1 ], [ 1, 3 ] ],
},
{
items1 => [ [ 1, 1 ], [ 2, 2 ], [ 3, 3 ] ],
items2 => [ [ 2, 3 ], [ 2, 4 ] ],
}
);
for my $example (@examples) {
my @output = merge_items($example);
my $output = join ', ', map { make_block($_) } @output;
my $items1 = join ', ', map { make_block($_) } $example->{items1}->@*;
my $items2 = join ', ', map { make_block($_) } $example->{items2}->@*;
say <<"END";
Input: \@items1 = [ $items1 ]
\@items2 = [ $items2 ]
Output: [ $output ]
END
}
sub make_block ($ref) {
my $list = join ',', $ref->@*;
return qq{[$list]};
}
sub merge_items ($example) {
my %output;
for my $p ( $example->{items1}->@*, $example->{items2}->@* ) {
my ( $item_id, $quantity ) = $p->@*;
$output{$item_id} += $quantity;
}
return map { [ int $_, $output{$_} ] } sort keys %output;
}
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