From 31730009a636f5b2646aa5c8be60679a081f4fc1 Mon Sep 17 00:00:00 2001
From: Roger Bell_West <roger@firedrake.org>
Date: Mon, 8 Jun 2020 13:27:12 +0100
Subject: Solutions to challenge #64.

---
 challenge-064/roger-bell-west/perl/ch-1.pl | 40 ++++++++++++++++++++++++++
 challenge-064/roger-bell-west/perl/ch-2.pl | 45 +++++++++++++++++++++++++++++
 challenge-064/roger-bell-west/raku/ch-1.p6 | 34 ++++++++++++++++++++++
 challenge-064/roger-bell-west/raku/ch-2.p6 | 46 ++++++++++++++++++++++++++++++
 4 files changed, 165 insertions(+)
 create mode 100755 challenge-064/roger-bell-west/perl/ch-1.pl
 create mode 100755 challenge-064/roger-bell-west/perl/ch-2.pl
 create mode 100755 challenge-064/roger-bell-west/raku/ch-1.p6
 create mode 100755 challenge-064/roger-bell-west/raku/ch-2.p6

diff --git a/challenge-064/roger-bell-west/perl/ch-1.pl b/challenge-064/roger-bell-west/perl/ch-1.pl
new file mode 100755
index 0000000000..c8dc9b03f7
--- /dev/null
+++ b/challenge-064/roger-bell-west/perl/ch-1.pl
@@ -0,0 +1,40 @@
+#! /usr/bin/perl
+
+use strict;
+use warnings;
+
+use List::Util qw(sum);
+use utf8;
+
+my @in=(
+  [qw(1 2 3)],
+  [qw(4 5 6)],
+  [qw(7 8 9)],
+    );
+
+my @l=([0,0]);
+
+my $s;
+my @p;
+
+while (@l) {
+  my $t=shift @l;
+  my @xy=splice @{$t},0,2;
+  push @{$t},$in[$xy[0]][$xy[1]];
+  if ($t->[-1] == $in[-1][-1]) {
+    my $sa=sum(@{$t});
+    if (!defined $s || $sa < $s) {
+      $s=$sa;
+      @p=@{$t};
+    }
+  }
+  if ($xy[0] < $#in && $xy[1] <= $#{$in[$xy[0]+1]}) {
+    push @l,[$xy[0]+1,$xy[1],@{$t}];
+  }
+  if ($xy[1] < $#{$in[$xy[0]]}) {
+    push @l,[$xy[0],$xy[1]+1,@{$t}];
+  }
+}
+
+binmode STDOUT,':utf8';
+print "$s ( ".join(' → ',@p)." )\n";
diff --git a/challenge-064/roger-bell-west/perl/ch-2.pl b/challenge-064/roger-bell-west/perl/ch-2.pl
new file mode 100755
index 0000000000..b52abc4db7
--- /dev/null
+++ b/challenge-064/roger-bell-west/perl/ch-2.pl
@@ -0,0 +1,45 @@
+#! /usr/bin/perl
+
+use strict;
+use warnings;
+
+my $S="perlweeklychallenge";
+my @W = ("weekly", "challenge", "perl");
+
+#$S="perlandraku";
+#@W = (qw(python ruby haskell));
+
+my $sl=length($S);
+
+my @l;
+my $done=0;
+
+while (!$done) {
+  my $c=[];
+  if (@l) {
+    $c=shift @l;
+  }
+  my $cc=join('',@{$c});
+  foreach my $wc (@W) {
+    my $ccw=$cc.$wc;
+    my $ccwl=length($ccw);
+    if ($ccwl <= $sl) {
+      if (index($S,$ccw)==0) {
+        push @l,[@{$c},$wc];
+        if ($ccwl == $sl) {
+          $done=1;
+          last;
+        }
+      }
+    }
+  }
+  unless (@l) {
+    last;
+  }
+}
+
+if (@l) {
+  print join(', ',map {'"' . $_ . '"'} @{$l[-1]}),"\n";
+} else {
+  print "0\n";
+}
diff --git a/challenge-064/roger-bell-west/raku/ch-1.p6 b/challenge-064/roger-bell-west/raku/ch-1.p6
new file mode 100755
index 0000000000..af1d3e423c
--- /dev/null
+++ b/challenge-064/roger-bell-west/raku/ch-1.p6
@@ -0,0 +1,34 @@
+#! /usr/bin/perl6
+
+my @in=(
+  (1,2,3),
+  (4,5,6),
+  (7,8,9),
+    );
+
+
+my @l=((0,0),);
+
+my $s='';
+my @p;
+
+while (@l) {
+  my @t=(shift @l).flat;
+  my @xy=splice @t,0,2;
+  push @t,@in[@xy[0]][@xy[1]];
+  if (@t[@t.end] == @in[@in.end][@in[@in.end].end]) {
+    my $sa=sum(@t);
+    if ($s eq '' || $sa < $s) {
+      $s=$sa;
+      @p=@t;
+    }
+  }
+  if (@xy[0] < @in.end && @xy[1] <= @in[@xy[0]+1].end) {
+    push @l,(@xy[0]+1,@xy[1],map {$_},@t);
+  }
+  if (@xy[1] < @in[@xy[0]].end) {
+    push @l,(@xy[0],@xy[1]+1,map {$_},@t);
+  }
+}
+
+say "$s ( " ~ join(' → ',@p) ~ " )";
diff --git a/challenge-064/roger-bell-west/raku/ch-2.p6 b/challenge-064/roger-bell-west/raku/ch-2.p6
new file mode 100755
index 0000000000..abb18707ae
--- /dev/null
+++ b/challenge-064/roger-bell-west/raku/ch-2.p6
@@ -0,0 +1,46 @@
+#! /usr/bin/perl6
+
+my $S="perlweeklychallenge";
+my @W = ("weekly", "challenge", "perl");
+
+#$S="perlandraku";
+#@W = ("python","ruby","haskell");
+
+my $sl=chars($S);
+
+my @l;
+my $done=0;
+
+while (!$done) {
+  my @c;
+  if (@l) {
+    @c=map {$_},(shift @l).flat;
+  }
+  my $cc=join('',@c);
+  for @W -> $wc {
+    my $ccw=$cc ~ $wc;
+    my $ccwl=chars($ccw);
+    if ($ccwl <= $sl) {
+      with index($S,$ccw) -> $i {
+        if ($i==0) {
+          my @q=@c;
+          push @q,$wc;
+          push @l,@q;
+          if ($ccwl == $sl) {
+            $done=1;
+            last;
+          }
+        }
+      }
+    }
+  }
+  unless (@l) {
+    last;
+  }
+}
+
+if (@l) {
+  say join(', ',map {'"' ~ $_ ~ '"'},@l[@l.end].flat);
+} else {
+  say 0;
+}
-- 
cgit