Solution to task 1

1 files changed, 66 insertions, 0 deletions

diff --git a/challenge-284/jo-37/perl/ch-1.pl b/challenge-284/jo-37/perl/ch-1.pl
new file mode 100755
index 0000000000..ceab3d9239
--- /dev/null
+++ b/challenge-284/jo-37/perl/ch-1.pl
@@ -0,0 +1,66 @@
+#!/usr/bin/perl -s
+
+use v5.24;
+use Test2::V0 '!float';
+use PDL '2.017';
+use PDL::NiceSlice;
+
+our ($tests, $examples);
+
+run_tests() if $tests || $examples;	# does not return
+
+die <<EOS unless @ARGV;
+usage: $0 [-examples] [-tests] [N]
+
+-examples
+    run the examples from the challenge
+ 
+-tests
+    run some tests
+
+N...
+    list of integers
+
+EOS
+
+
+### Input and Output
+
+say lucky_integer(@ARGV);
+
+
+### Implementation
+#
+# For details see:
+# https://github.sommrey.de/the-bears-den/2024/08/30/ch-284.html#task-1
+
+
+sub lucky_integer {
+    my ($freq, $val) = rle long(@_)->qsort;
+    my $lucky = $val->where($freq == $val);
+    $lucky->isempty ? -1 : $lucky(-1;-);
+}
+
+
+### Examples and tests
+
+sub run_tests {
+    SKIP: {
+        skip "examples" unless $examples;
+
+        is lucky_integer(2, 2, 3, 4), 2, 'example 1';
+        is lucky_integer(1, 2, 2, 3, 3, 3), 3, 'example 2';
+        is lucky_integer(1, 1, 1, 3), -1, 'example 3';
+    }
+
+    SKIP: {
+        skip "tests" unless $tests;
+
+        is lucky_integer(
+            qw(11 1 11 2 11 2 11 3 11 3 11 3 11 4 11 4 11 4 11 4 11)), 11,
+            'these go to eleven';
+	}
+
+    done_testing;
+    exit;
+}