1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
#!/usr/bin/perl
use v5.26;
use Test2::V0 qw(!float -no_srand);
use Test2::Tools::Subtest 'subtest_streamed';
use Test2::Tools::PDL;
use Getopt::Long;
use experimental 'signatures';
use PDL;
use PDL::NiceSlice;
### Options and Arguments
my ($tests, $examples, $verbose);
GetOptions(
'examples!' => \$examples,
'tests!' => \$tests,
'verbose!' => \$verbose,
) or usage();
run_tests($examples, $tests); # tests do not return
usage() unless @ARGV;
sub usage {
die <<~EOS;
$0 - minimum absolute difference pairs
usage: $0 [-examples] [-tests] [--] [N...]
-examples
run the examples from the challenge
-tests
run some tests
N...
list of integers
EOS
}
### Input and Output
say mad_pairs(@ARGV);
### Implementation
#
# For details see:
# https://github.sommrey.de/the-bears-den/2025/06/27/ch-327.html#task-2
sub mad_pairs {
my $i = long @_;
my $diff = $i - $i(*1);
my $adiff = abs($diff)->setbadif(ones($diff)->tricpy(1));
$i->index(scalar whichND $adiff == $adiff->min)->qsort->qsortvec;
}
### Examples and Tests
sub run_tests ($examples, $tests) {
return unless $examples || $tests;
state sub run_example ($args, $expected, $name) {
my $result = mad_pairs(@$args);
pdl_is $result, $expected,
"$name: (@$args) -> $expected";
}
plan 2;
$examples ? subtest_streamed(examples => sub {
my @examples = (
[[4, 1, 2, 3], pdl([1, 2], [2, 3], [3, 4]), 'example 1'],
[[1, 3, 7, 11, 15], pdl([[1, 3]]), 'example 2'],
[[1, 5, 3, 8], pdl([1,3], [3,5]), 'example 3'],
);
plan scalar @examples;
for (@examples) {
run_example @$_;
}
}) : pass 'skip examples';
$tests ? subtest_streamed(tests => sub {
plan 1;
pass 'no tests';
}) : pass 'skip tests';
exit;
}
|
