Merge pull request #10142 from jo-37/contrib

Solutions to challenge 270

3 files changed, 146 insertions, 0 deletions

diff --git a/challenge-270/jo-37/blog.txt b/challenge-270/jo-37/blog.txt
new file mode 100644
index 0000000000..fc81d9be72
--- /dev/null
+++ b/challenge-270/jo-37/blog.txt
@@ -0,0 +1 @@
+https://github.sommrey.de/the-bears-den/2024/05/24/ch-270.html
diff --git a/challenge-270/jo-37/perl/ch-1.pl b/challenge-270/jo-37/perl/ch-1.pl
new file mode 100755
index 0000000000..932b41e780
--- /dev/null
+++ b/challenge-270/jo-37/perl/ch-1.pl
@@ -0,0 +1,67 @@
+#!/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;
+usage: $0 [-examples] [-tests] [M]
+
+-examples
+    run the examples from the challenge
+ 
+-tests
+    run some tests
+
+M
+    matrix in any form acceptedd by the PDL string constructor, e.g.
+    '[ [1, 0, 0], [0, 0, 1], [1, 0, 0] ]'
+
+
+EOS
+
+
+### Input and Output
+
+say count_special("@ARGV");
+
+
+### Implementation
+#
+# For details see:
+# https://github.sommrey.de/the-bears-den/2024/05/24/ch-270.html#task-1
+
+
+sub count_special {
+	my $m = pdl @_;
+    which($m * $m->sumover->dummy(0) * $m->xchg(0, 1)->sumover == 1)->nelem;
+}
+
+
+### Examples and tests
+
+sub run_tests {
+    SKIP: {
+        skip "examples" unless $examples;
+
+        is count_special([
+                [1, 0, 0],
+                [0, 0, 1],
+                [1, 0, 0],]), 1, 'example 1';
+        is count_special([
+                [1, 0, 0],
+                [0, 1, 0],
+                [0, 0, 1],]), 3, 'example 2';
+    }
+
+    SKIP: {
+        skip "tests" unless $tests;
+	}
+
+    done_testing;
+    exit;
+}
diff --git a/challenge-270/jo-37/perl/ch-2.pl b/challenge-270/jo-37/perl/ch-2.pl
new file mode 100755
index 0000000000..05435dc0ed
--- /dev/null
+++ b/challenge-270/jo-37/perl/ch-2.pl
@@ -0,0 +1,78 @@
+#!/usr/bin/perl -s
+
+use v5.24;
+use Test2::V0 '!float';
+use PDL v2.077; # for minimum_n_ind
+use PDL::NiceSlice;
+use experimental 'signatures';
+
+our ($tests, $examples, $verbose, $x, $y);
+
+run_tests() if $tests || $examples;	# does not return
+
+die <<EOS unless defined $x && defined $y && @ARGV;
+usage: $0 [-examples] [-tests] [-verbose] [-x=X -y=Y INT...]
+
+-examples
+    run the examples from the challenge
+ 
+-tests
+    run some tests
+
+-verbose
+    show intermediate steps
+
+-x=X
+    cost for 'level 1' operations
+
+-y=Y
+    cost for 'level 2' operations
+
+INT...
+    list of integers
+EOS
+
+
+### Input and Output
+
+say equalize_array($x, $y, @ARGV);
+
+
+### Implementation
+#
+# For details see:
+# https://github.sommrey.de/the-bears-den/2024/05/24/ch-270.html#task-2
+
+
+sub equalize_array ($x, $y, @ints) {
+    my $ints = pdl @ints;
+    return 0 if $ints->dim(0) < 2;
+    my $target = maximum $ints;
+    return $x * ($ints->dim(0) * $target - sum($ints)) if $y >= 2 * $x;
+    my $cost = 0;
+    while () {
+        say $ints if $verbose;
+        my $min = $ints->index(minimum_n_ind($ints, 2));
+        return $cost + $x * ($target - $min((0))) if $min((1)) == $target;
+        $min += 1;
+        $cost += $y;
+    }
+}
+
+### Examples and tests
+
+sub run_tests {
+    SKIP: {
+        skip "examples" unless $examples;
+
+        is equalize_array(3, 2 ,=> 4, 1), 9, 'example 1';
+        is equalize_array(2, 1 ,=> 2, 3, 3, 3, 5), 6, 'example 2';
+    }
+
+    SKIP: {
+        skip "tests" unless $tests;
+	}
+
+    done_testing;
+    exit;
+}