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#!/usr/bin/env perl
# vim:set ts=4 sw=4 sts=4 et ai wm=0 nu:
#=============================================================================
# Copyright (c) 2024, Bob Lied
#=============================================================================
# ch-2.pl Perl Weekly Challenge 263 Task 2 Merge Items
#=============================================================================
# You are given two 2-D array of positive integers, $items1 and $items2
# where element is pair of (item_id, item_quantity).
# Write a script to return the merged items.
# Example 1 Input: $items1 = [ [1,1], [2,1], [3,2] ]
# $items2 = [ [2,2], [1,3] ]
# Output: [ [1,4], [2,3], [3,2] ]
# Item id (1) appears 2 times: [1,1] and [1,3]. Merged item now (1,4)
# Item id (2) appears 2 times: [2,1] and [2,2]. Merged item now (2,3)
# Item id (3) appears 1 time: [3,2]
# Example 2 Input: $items1 = [ [1,2], [2,3], [1,3], [3,2] ]
# $items2 = [ [3,1], [1,3] ]
# Output: [ [1,8], [2,3], [3,3] ]
# Example 3 Input: $items1 = [ [1,1], [2,2], [3,3] ]
# $items2 = [ [2,3], [2,4] ]
# Output: [ [1,1], [2,9], [3,3] ]
#=============================================================================
use v5.38;
use builtin qw/true false/; no warnings "experimental::builtin";
use Getopt::Long;
my $Verbose = 0;
my $DoTest = 0;
GetOptions("test" => \$DoTest, "verbose" => \$Verbose);
exit(!runTest()) if $DoTest;
sub mergeItems($items1, $items2)
{
my %merged;
for my $list ( $items1, $items2 )
{
for my $kv ( $list->@* )
{
$merged{$kv->[0]} += $kv->[1];
}
}
return [ map { [ $_, $merged{$_} ] } sort keys %merged ];
}
sub runTest
{
use Test2::V0;
my $items1; my $items2; my $expected;
$items1 = [ [1,1], [2,1], [3,2] ];
$items2 = [ [2,2], [1,3] ];
$expected = [ [1,4], [2,3], [3,2] ];
is( mergeItems($items1, $items2), $expected, "Example 1");
$items1 = [ [1,2], [2,3], [1,3], [3,2] ];
$items2 = [ [3,1], [1,3] ];
$expected = [ [1,8], [2,3], [3,3] ];
is( mergeItems($items1, $items2), $expected, "Example 2");
$items1 = [ [1,1], [2,2], [3,3] ];
$items2 = [ [2,3], [2,4] ];
$expected = [ [1,1], [2,9], [3,3] ];
is( mergeItems($items1, $items2), $expected, "Example 3");
done_testing;
}
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