Solution to task 2

1 files changed, 97 insertions, 0 deletions

diff --git a/challenge-324/jo-37/perl/ch-2.pl b/challenge-324/jo-37/perl/ch-2.pl
new file mode 100755
index 0000000000..56b8069106
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+++ b/challenge-324/jo-37/perl/ch-2.pl
@@ -0,0 +1,97 @@
+#!/usr/bin/perl
+
+use v5.26;
+use Test2::V0 qw(!float -no_srand);
+use Test2::Tools::Subtest 'subtest_streamed';
+use Getopt::Long;
+use experimental 'signatures';
+
+use PDL;
+
+### 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 - total xor
+
+    usage: $0 [-examples] [-tests] [N...]
+
+    -examples
+        run the examples from the challenge
+     
+    -tests
+        run some tests
+
+    N...
+        list of integers
+
+    EOS
+}
+
+
+### Input and Output
+
+say total_xor(@ARGV);
+
+
+### Implementation
+#
+# For details see:
+# https://github.sommrey.de/the-bears-den/2025/06/06/ch-324.html#task-2
+
+sub total_xor {
+    longlong(@_)->bor->shiftleft(@_ - 1);
+}
+
+
+### Examples and Tests
+
+sub run_tests ($examples, $tests) {
+    return unless $examples || $tests;
+
+    state sub run_example ($args, $expected, $name) {
+        my $result = total_xor(@$args);
+        is $result, $expected,
+            "$name: (@$args) -> $expected";
+    }
+
+    plan 2;
+
+    $examples ? subtest_streamed(examples => sub {
+        my @examples = (
+            [[1, 3], 6, 'example 1'],
+            [[5, 1, 6], 28, 'example 2'],
+            [[3 .. 8], 480, 'example 3'],
+        );
+        plan scalar @examples;
+        for (@examples) {
+            run_example @$_;
+        }
+    }) : pass 'skip examples';
+
+    $tests ? subtest_streamed(tests => sub {
+        plan 3;
+        is total_xor(1, 1, 1), 4, 'example from blog';
+        is total_xor((1) x 32), 2**31, 'some more ones';
+
+        # cross check on random bits from random ints:
+        # perl -Mntheory=:all -E 'forcomb {$s = 0; $s ^= $ARGV[$_] for @_; $t += $s} @ARGV; say $t' 33600 541464 573584 557328 49616 525596 49372 34636 575368 575316 50640 1228 34112 1472 542020 557776 575112 557660 17988 33996
+        is total_xor(33600, 541464, 573584, 557328, 49616, 525596,
+            49372, 34636, 575368, 575316, 50640, 1228, 34112, 1472,
+            542020, 557776, 575112, 557660, 17988, 33996),
+            301702578176, 'cross check';
+    }) : pass 'skip tests';
+
+    exit;
+}