some more solutions

3 files changed, 194 insertions, 0 deletions

diff --git a/challenge-145/jo-37/perl/ch-1.pl b/challenge-145/jo-37/perl/ch-1.pl
new file mode 100755
index 0000000000..220093fa67
--- /dev/null
+++ b/challenge-145/jo-37/perl/ch-1.pl
@@ -0,0 +1,55 @@
+#!/usr/bin/perl -s
+
+use v5.24;
+use Test2::V0 '!float';
+use PDL;
+use experimental 'signatures';
+
+our ($tests, $examples);
+
+run_tests() if $tests || $examples;	# does not return
+
+die <<EOS unless @ARGV == 2;
+usage: $0 [-examples] [-tests] [X Y]
+
+-examples
+    run the examples from the challenge
+ 
+-tests
+    run some tests
+
+X Y
+    two vectors in any representation as accepted by the PDL
+    constructor, e.g.  x1,x2,...
+
+EOS
+
+
+### Input and Output
+
+say dot_product(@ARGV);
+
+
+### Implementation
+
+sub dot_product ($x, $y) {
+    (pdl($x) x pdl($y)->dummy(0))->sclr;
+}
+
+
+### Examples and tests
+
+sub run_tests {
+    SKIP: {
+        skip "examples" unless $examples;
+
+        is dot_product([1, 2, 3], [4, 5, 6]), 32, 'example';
+    }
+
+    SKIP: {
+        skip "tests" unless $tests;
+	}
+
+    done_testing;
+    exit;
+}
diff --git a/challenge-146/jo-37/perl/ch-2.pl b/challenge-146/jo-37/perl/ch-2.pl
new file mode 100755
index 0000000000..aedafe7fdd
--- /dev/null
+++ b/challenge-146/jo-37/perl/ch-2.pl
@@ -0,0 +1,69 @@
+#!/usr/bin/perl -s
+
+use v5.24;
+use Test2::V0;
+use experimental 'signatures';
+
+our ($tests, $examples);
+
+run_tests() if $tests || $examples;	# does not return
+
+die <<EOS unless @ARGV == 1;
+usage: $0 [-examples] [-tests] [D/N]
+
+-examples
+    run the examples from the challenge
+ 
+-tests
+    run some tests
+
+D/N
+    fraction
+
+EOS
+
+
+### Input and Output
+
+main: {
+    my @parents;
+    push @parents, curious_parent(split m{/}, shift, 2);
+    push @parents, curious_parent($parents[-1]->@*);
+    local $, = ' ';
+    say map {join '/', @$_} @parents;
+}
+
+
+### Implementation
+
+# The child nodes are made from the parent's
+# - numerator and numerator + denominator
+# - numerator + denominator and denominator
+# In reverse, the parent depends on the order of the child's denominator
+# and numerator and may be reconstructed easily.
+sub curious_parent ($d, $n) {
+    $d < $n ? [$d, $n - $d] : [$d - $n, $n];	
+}
+
+
+### Examples and tests
+
+sub run_tests {
+    SKIP: {
+        skip "examples" unless $examples;
+        my $parent = curious_parent(3, 5);
+        is $parent, [3, 2], 'example 1 parent';
+        is curious_parent(@$parent), [1, 2], 'example 1 grandparent';
+
+        $parent = curious_parent(4, 3);
+        is $parent, [1, 3], 'example 2 parent';
+        is curious_parent(@$parent), [1, 2], 'example 2 grandparent';
+    }
+
+    SKIP: {
+        skip "tests" unless $tests;
+	}
+
+    done_testing;
+    exit;
+}
diff --git a/challenge-147/jo-37/perl/ch-1.pl b/challenge-147/jo-37/perl/ch-1.pl
new file mode 100755
index 0000000000..bef3fd8a26
--- /dev/null
+++ b/challenge-147/jo-37/perl/ch-1.pl
@@ -0,0 +1,70 @@
+#!/usr/bin/perl -s
+
+use v5.24;
+use Test2::V0;
+use warnings FATAL => 'all';
+use Math::Prime::Util qw(fromdigits todigits is_prime);
+use Data::Dump qw(dd pp);
+use experimental 'signatures';
+
+our ($tests, $examples, $base);
+$base ||= 10;
+
+run_tests() if $tests || $examples;	# does not return
+
+die <<EOS unless @ARGV;
+usage: $0 [-examples] [-tests] [-base=B] [N]
+
+-examples
+    run the examples from the challenge
+ 
+-tests
+    run some tests
+
+-base=B
+    use base B. Default: 10
+
+N
+    check if N is a left-truncatable prime in base B
+
+EOS
+
+
+### Input and Output
+
+say 0 + !!is_truncatable_prime(shift, $base);
+
+
+### Implementation
+
+sub is_truncatable_prime ($p, $b) {
+    my @p = todigits($p, $b);
+    while (@p) {
+        $p = fromdigits([@p], $b);
+        return unless is_prime($p);
+        shift @p;
+    }
+	1;
+}
+
+
+### Examples and tests
+
+sub run_tests {
+    SKIP: {
+        skip "examples" unless $examples;
+
+        ok is_truncatable_prime(9137, 10), 'example';
+    }
+
+    SKIP: {
+        skip "tests" unless $tests;
+        
+        ok !is_truncatable_prime(15, 10), '15';
+        ok  is_truncatable_prime(17, 10), '17';
+        ok !is_truncatable_prime(19, 10), '19';
+	}
+
+    done_testing;
+    exit;
+}