From 8f96add9955393ac2040750a7bf515f54b04740f Mon Sep 17 00:00:00 2001
From: Dave Jacoby <jacoby.david@gmail.com>
Date: Mon, 3 Jan 2022 16:18:47 -0500
Subject: 146

---
 challenge-146/dave-jacoby/blog.txt     |   1 +
 challenge-146/dave-jacoby/perl/ch-1.pl |  26 +++++++
 challenge-146/dave-jacoby/perl/ch-2.pl | 122 +++++++++++++++++++++++++++++++++
 3 files changed, 149 insertions(+)
 create mode 100644 challenge-146/dave-jacoby/blog.txt
 create mode 100644 challenge-146/dave-jacoby/perl/ch-1.pl
 create mode 100644 challenge-146/dave-jacoby/perl/ch-2.pl

diff --git a/challenge-146/dave-jacoby/blog.txt b/challenge-146/dave-jacoby/blog.txt
new file mode 100644
index 0000000000..c04583b202
--- /dev/null
+++ b/challenge-146/dave-jacoby/blog.txt
@@ -0,0 +1 @@
+https://jacoby.github.io/2022/01/03/fractions-trees-and-primes-weekly-challenge-146.html
diff --git a/challenge-146/dave-jacoby/perl/ch-1.pl b/challenge-146/dave-jacoby/perl/ch-1.pl
new file mode 100644
index 0000000000..da52a09f89
--- /dev/null
+++ b/challenge-146/dave-jacoby/perl/ch-1.pl
@@ -0,0 +1,26 @@
+#!/usr/bin/env perl
+
+use strict;
+use warnings;
+use feature qw{ say postderef signatures state };
+no warnings qw{ experimental };
+
+my @primes;
+my $c = 1;
+my $n = 2;
+
+while (1) {
+    if ( is_prime($n) ) {
+        if ( $c == 10001 ) {
+            say join "\t", $c, $n if $c == 10001;
+            exit;
+        }
+        $c++;
+    }
+    $n++;
+}
+
+sub is_prime ($n) {
+    for ( 2 .. sqrt $n ) { return unless $n % $_ }
+    return 1;
+}
diff --git a/challenge-146/dave-jacoby/perl/ch-2.pl b/challenge-146/dave-jacoby/perl/ch-2.pl
new file mode 100644
index 0000000000..b09ed82974
--- /dev/null
+++ b/challenge-146/dave-jacoby/perl/ch-2.pl
@@ -0,0 +1,122 @@
+#!/usr/bin/env perl
+
+use strict;
+use warnings;
+use feature qw{ say postderef signatures state };
+no warnings qw{ experimental };
+
+my %node;
+for my $i (
+    qw{
+    1/1 1/2 2/1
+    1/3 3/2 2/3
+    3/1 1/4 4/3
+    3/5 5/2 2/5
+    5/3 3/4 4/1
+    }
+    )
+{
+    $node{$i} = Node->new($i);
+}
+
+$node{'1/1'}->left( $node{'1/2'} );    # 1
+$node{'1/1'}->right( $node{'2/1'} );   # 1
+
+$node{'1/2'}->left( $node{'1/3'} );    # 2
+$node{'1/2'}->right( $node{'3/2'} );   # 2
+
+$node{'1/3'}->left( $node{'1/4'} );    # 3
+$node{'1/3'}->right( $node{'4/3'} );   # 3
+
+$node{'2/1'}->left( $node{'2/3'} );    # 2
+$node{'2/1'}->right( $node{'3/1'} );   # 2
+
+$node{'2/3'}->left( $node{'2/5'} );    # 3
+$node{'2/3'}->right( $node{'5/3'} );   # 3
+
+$node{'3/1'}->left( $node{'3/4'} );    # 3
+$node{'3/1'}->right( $node{'4/1'} );   # 3
+
+$node{'3/2'}->left( $node{'3/5'} );    # 3
+$node{'3/2'}->right( $node{'5/2'} );   # 3
+
+for my $n ( sort keys %node ) {
+    my $node        = $node{$n};
+    my $parent      = '';
+    my $grandparent = '';
+    if ( defined $node->parent ) {
+        $parent = $node->parent->value;
+        if ( defined $node->parent->parent ) {
+            $grandparent = $node->parent->parent->value;
+        }
+    }
+    say <<"END";
+    INPUT: \$member = "$n"
+    OUTPUT: parent = "$parent" and grandparent = "$grandparent"
+END
+}
+
+package Node;
+
+sub new ( $class, $value = 0 ) {
+    my $self = {};
+    $self->{value}      = $value;
+    $self->{left}       = undef;
+    $self->{right}      = undef;
+    $self->{horizontal} = undef;
+    $self->{parent}     = undef;
+    return bless $self, $class;
+}
+
+sub value ( $self, $value = undef ) {
+    if ( defined $value ) {
+        $self->{value} = $value;
+    }
+    else {
+        return $self->{value};
+    }
+}
+
+sub is_root ( $self ) {
+    return defined $self->{parent} ? 0 : 1;
+}
+
+sub is_leaf ( $self ) {
+    return ( !defined $self->{left} && !defined $self->{right} )
+        ? 1
+        : 0;
+}
+
+sub left ( $self, $node = undef ) {
+    if ( defined $node ) {
+        $self->{left}   = $node;
+        $node->{parent} = $self;
+    }
+    else {
+        return $self->{left};
+    }
+}
+
+sub right ( $self, $node = undef ) {
+    if ( defined $node ) {
+        $self->{right}  = $node;
+        $node->{parent} = $self;
+    }
+    else {
+        return $self->{right};
+    }
+}
+
+sub horizontal ( $self, $node = undef ) {
+    if ( defined $node ) {
+        $self->{horizontal} = $node;
+        $node->{parent}     = $self;
+    }
+    else {
+        return $self->{horizontal};
+    }
+}
+
+sub parent ($self ) {
+    return $self->{parent};
+}
-- 
cgit