Initial 219 (Raku)

2 files changed, 61 insertions, 0 deletions

diff --git a/challenge-219/mark-anderson/raku/ch-1.raku b/challenge-219/mark-anderson/raku/ch-1.raku
new file mode 100644
index 0000000000..b6bf41ca47
--- /dev/null
+++ b/challenge-219/mark-anderson/raku/ch-1.raku
@@ -0,0 +1,10 @@
+#!/usr/bin/env raku
+use Test;
+
+is sorted-squares(-2,-1,0,3,4), (0,1,4,9,16);
+is sorted-squares(5,-4,-1,3,6), (1,9,16,25,36);
+
+sub sorted-squares(+$a)
+{
+    sort $a >>**>> 2
+}
diff --git a/challenge-219/mark-anderson/raku/ch-2.raku b/challenge-219/mark-anderson/raku/ch-2.raku
new file mode 100644
index 0000000000..c59f4dcbce
--- /dev/null
+++ b/challenge-219/mark-anderson/raku/ch-2.raku
@@ -0,0 +1,51 @@
+#!/usr/bin/env raku
+use Test;
+
+is travel-expenditure(1,5,6,7,9,15),                   11; 
+is travel-expenditure(1,2,3,5,7,10,11,12,14,20,30,31), 20; 
+is travel-expenditure(1..2500),                        2088; 
+is travel-expenditure(1..2520),                        2100; 
+is travel-expenditure(1..2525),                        2107; 
+is travel-expenditure(1..2528),                        2109; 
+
+# Not the most elegant solution but it's pretty fast.
+
+sub travel-expenditure(+@days)
+{
+    my $cost;
+    my %cost     := { 1 => 2, 7 => 7, 30 => 25 }
+    my %min-span := { 1 => 1, 7 => 4, 30 => 23 }
+
+    for (30,7,1) -> $n
+    {
+        loop
+        {
+            last unless @days;
+            my %days = @days.antipairs;
+            my @mm = @days.minmax.rotor($n => $n-1);
+
+            unless @mm
+            {
+                delete-days(@days) if @days.minmax >= %min-span{$n};
+                last
+            }
+
+            my @ints = do ($_ (&) @days).keys for @mm;
+
+            my %c = @ints.classify({ .elems });
+
+            last unless %c.max.key >= %min-span{$n};
+        
+            delete-days(%c.max.value.head);
+    
+            sub delete-days(@a)
+            {
+                %days{@a}:delete;
+                @days = %days.keys>>.Int;
+                $cost += %cost{$n};
+            }
+        }
+    }
+
+    $cost
+}