Solution to task 2

1 files changed, 62 insertions, 0 deletions

diff --git a/challenge-262/jo-37/perl/ch-2.pl b/challenge-262/jo-37/perl/ch-2.pl
new file mode 100755
index 0000000000..bae511c438
--- /dev/null
+++ b/challenge-262/jo-37/perl/ch-2.pl
@@ -0,0 +1,62 @@
+#!/usr/bin/perl -s
+
+use v5.24;
+use Test2::V0 '!float';
+use PDL;
+
+our ($tests, $examples);
+
+run_tests() if $tests || $examples;	# does not return
+
+die <<EOS unless @ARGV > 1;
+usage: $0 [-examples] [-tests] [K I...]
+
+-examples
+    run the examples from the challenge
+ 
+-tests
+    run some tests
+
+K
+    (positive) integer
+
+I...
+    list of integers
+
+EOS
+
+
+### Input and Output
+
+say ced(@ARGV);
+
+
+### Implementation
+
+sub ced {
+    my $k = shift;
+	my $ints = long @_;
+    my $i = sequence($ints);
+    my $j = $i->dummy(0);
+
+    which(($j > $i) & ($ints->dummy(0) == $ints) & ! ($i * $j % $k))->nelem;
+}
+
+
+### Examples and tests
+
+sub run_tests {
+    SKIP: {
+        skip "examples" unless $examples;
+
+        is ced(2 ,=> 3,1,2,2,2,1,3), 4, 'example 1';
+        is ced(1,2,3), 0, 'example 2';
+    }
+
+    SKIP: {
+        skip "tests" unless $tests;
+	}
+
+    done_testing;
+    exit;
+}