challenge 285, raku solutions

3 files changed, 42 insertions, 0 deletions

diff --git a/challenge-285/feng-chang/raku/ch-1.raku b/challenge-285/feng-chang/raku/ch-1.raku
new file mode 100755
index 0000000000..a60e8f5475
--- /dev/null
+++ b/challenge-285/feng-chang/raku/ch-1.raku
@@ -0,0 +1,6 @@
+#!/bin/env raku
+
+unit sub MAIN(Str:D $r);
+
+my %routes = $r.comb.rotor(2).map({ .[0] => .[1] });
+put %routes.values.grep({ !%routes{$_}.defined }).first;
diff --git a/challenge-285/feng-chang/raku/ch-2.raku b/challenge-285/feng-chang/raku/ch-2.raku
new file mode 100755
index 0000000000..3670056183
--- /dev/null
+++ b/challenge-285/feng-chang/raku/ch-2.raku
@@ -0,0 +1,13 @@
+#!/bin/env raku
+
+unit sub MAIN(UInt:D \amount);
+
+proto changes(UInt:D \amount, UInt:D \limit --> UInt:D) {*}
+multi changes(0, $_)  { 1 }
+multi changes(\a, 1)  { 1 }
+multi changes(\a, 50) { (0..a div 50).map({ changes(a - $_ * 50, 25) }).sum }
+multi changes(\a, 25) { (0..a div 25).map({ changes(a - $_ * 25, 10) }).sum }
+multi changes(\a, 10) { (0..a div 10).map({ changes(a - $_ * 10,  5) }).sum }
+multi changes(\a, 5)  { (0..a div  5).map({ changes(a - $_ *  5,  1) }).sum } 
+
+put changes(amount, 50);
diff --git a/challenge-285/feng-chang/raku/test.raku b/challenge-285/feng-chang/raku/test.raku
new file mode 100755
index 0000000000..61705811a5
--- /dev/null
+++ b/challenge-285/feng-chang/raku/test.raku
@@ -0,0 +1,23 @@
+#!/bin/env raku
+
+# The Weekly Challenge 285
+use Test;
+
+sub pwc-test(Str:D $script, Bool :$deeply? = False, *@input) {
+    my ($expect, $assertion) = @input.splice(*-2, 2);
+    my $p = run $script, |@input, :out;
+    if $deeply {
+        is-deeply $p.out.slurp(:close).chomp.words.Bag, $expect, $assertion;
+    } else {
+        is $p.out.slurp(:close).chomp, $expect, $assertion;
+    }
+}
+
+# Task 1, No Connection
+pwc-test './ch-1.raku', 'BCDBCA', 'A', 'No Connection: B=>C,D=>B,C=>A  => A';
+pwc-test './ch-1.raku', 'AZ',     'Z', 'No Connection: A=>Z            => Z';
+
+# Task 2, Maing Change
+pwc-test './ch-2.raku',  9,    2, 'Maing Change:   9 =>   2';
+pwc-test './ch-2.raku',  15,   6, 'Maing Change:  15 =>   6';
+pwc-test './ch-2.raku', 100, 292, 'Maing Change: 100 => 292';