Challenge 285 Solutions (Raku)

2 files changed, 55 insertions, 0 deletions

diff --git a/challenge-285/mark-anderson/raku/ch-1.raku b/challenge-285/mark-anderson/raku/ch-1.raku
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+++ b/challenge-285/mark-anderson/raku/ch-1.raku
@@ -0,0 +1,10 @@
+#!/usr/bin/env raku
+use Test;
+
+is no-connection((<B C>, <D B>, <C A>)), 'A';
+is no-connection((<A Z>,)),              'Z';
+
+sub no-connection($routes)
+{
+    $routes>>[1] (-) $routes>>[0]
+}
diff --git a/challenge-285/mark-anderson/raku/ch-2.raku b/challenge-285/mark-anderson/raku/ch-2.raku
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+++ b/challenge-285/mark-anderson/raku/ch-2.raku
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+#!/usr/bin/env raku
+use Test;
+
+is making-change(9),   2;
+is making-change(15),  6;
+is making-change(100), 292;
+
+is making-change-polymod(9),   2;
+is making-change-polymod(15),  6;
+is making-change-polymod(100), 292;
+
+sub making-change($amount)
+{
+    .elems given gather loop (my $n = 0; $n <= $amount; $n += 5)
+    {
+        loop (my $d = 0; $d <= $amount; $d += 10)
+        {
+            last if $n + $d > $amount; 
+    
+            loop (my $q = 0; $q <= $amount; $q += 25)
+            {
+                last if $d + $q > $amount;
+                last if $n + $d + $q > $amount;
+    
+                loop (my $h = 0; $h <= $amount; $h += 50)
+                {
+                    last if $q + $h > $amount;
+                    last if $d + $q + $h > $amount;
+                    last if $n + $d + $q + $h > $amount;
+                   .take
+                }
+            }
+        }
+    }
+}
+
+# This sub is like the one above without the short circuiting.
+sub making-change-polymod($amount)
+{
+    1 + .elems given do for 1..3464 
+    {   
+        my $p = .polymod(21,11,5,3).List;
+        $p if ([+] $p.head(4) Z* (5,10,25,50)) <= $amount
+    }
+}