From 03ba649798e788e41d1c190434c5917848764966 Mon Sep 17 00:00:00 2001
From: Ruben Westerberg <drclaw@mac.com>
Date: Fri, 10 May 2019 11:30:06 +1000
Subject: Working version of ch-2.p6

---
 challenge-007/ruben-westerberg/perl5/ch-1.pl |  3 ++
 challenge-007/ruben-westerberg/perl6/ch-1.p6 |  6 +++
 challenge-007/ruben-westerberg/perl6/ch-2.p6 | 79 ++++++++++++++++++++++++++++
 3 files changed, 88 insertions(+)
 create mode 100755 challenge-007/ruben-westerberg/perl5/ch-1.pl
 create mode 100755 challenge-007/ruben-westerberg/perl6/ch-1.p6
 create mode 100755 challenge-007/ruben-westerberg/perl6/ch-2.p6

diff --git a/challenge-007/ruben-westerberg/perl5/ch-1.pl b/challenge-007/ruben-westerberg/perl5/ch-1.pl
new file mode 100755
index 0000000000..60facccdd1
--- /dev/null
+++ b/challenge-007/ruben-westerberg/perl5/ch-1.pl
@@ -0,0 +1,3 @@
+#!/usr/bin/env perl
+#niven numbers
+print join "\n" ,grep {  my $sum=0; $sum += $_ for (split "", $_); ($_> 0)&&(($_ % $sum) == 0)} (0..50);
diff --git a/challenge-007/ruben-westerberg/perl6/ch-1.p6 b/challenge-007/ruben-westerberg/perl6/ch-1.p6
new file mode 100755
index 0000000000..9dd2f11cc7
--- /dev/null
+++ b/challenge-007/ruben-westerberg/perl6/ch-1.p6
@@ -0,0 +1,6 @@
+#!/usr/bin/env perl6
+#
+#niven numbers
+
+say join "\n", (0..50) .grep({($_ > 0) && $_ %% (.Str.comb>>.Int .sum)});
+
diff --git a/challenge-007/ruben-westerberg/perl6/ch-2.p6 b/challenge-007/ruben-westerberg/perl6/ch-2.p6
new file mode 100755
index 0000000000..531b73e0f7
--- /dev/null
+++ b/challenge-007/ruben-westerberg/perl6/ch-2.p6
@@ -0,0 +1,79 @@
+#!/usr/bin/env perl6
+#
+#word ladder
+#read arguments, first is start word second is end word
+die "Need three arguments, start and end words" if @*ARGS.elems != 3;
+my ($start,$end, $wordFileName)=@*ARGS[0..2];
+
+my @words=$wordFileName.IO.lines.grep({.chars == $start.chars});
+unless $start.chars == $end.chars && @words.grep( { $_ eq all ($start, $end)} ) {
+	say ((););
+}
+
+say "Testing against @words.elems()";
+my @seen;
+my $s={word=>$start,parent=>Any};
+#my $node=transforms($start,$s);
+my @transforms;
+my $found=False;
+my $result;
+@transforms.push: $s;
+while @transforms > 0 && !$found {
+	my $current= @transforms.shift;
+	#make new transforms
+
+	@seen.push($current<word>);
+	my @toAdd=transforms($current);
+	#say @toAdd;
+	@transforms.append: @toAdd;
+	#say @transforms.elems;
+
+}
+#say $result;
+say pathFromParent($result, $start);
+	
+
+#read word list from file and filter by word length
+sub transforms($parent is rw) {
+	my $word=$parent<word>;
+	#@seen.push($word) ;
+	#my $node={:$word, parent=>$parent};
+	#say $word;
+	$found = $word eq $end;
+	$result=$parent if ($word eq $end) && (! so $result);
+
+	return if $found;
+
+	my @c=$word.comb;
+	constant @letters="a".."z";
+
+	#say $word;
+	my @transforms=gather {
+		for ^@c -> $c {
+			for  @letters -> $l {
+				my @tmp=@c;
+				@tmp[$c]=$l; 
+				my $w=@tmp.join;
+				if ( @seen.grep($w) == 0) {
+#				say $w;
+
+					take {word=>$w, parent=>$parent};
+				}
+			}
+		}
+	}
+	@transforms;
+}
+	
+sub pathFromParent($node, $word) {
+	my @path;
+	my $parent=$node;
+	while ($parent) {
+		@path.push: $parent<word>;
+		last if $parent<word> eq $word;
+		$parent=$parent<parent>;
+	}
+	@path.reverse;
+}
+
+
-- 
cgit