Week 336, Task 2, Raku, @ash

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+# Task 2 of the Weekly Challenge 336
+# https://theweeklychallenge.org/blog/perl-weekly-challenge-336/#TASK2
+
+say score "5", "2", "C", "D", "+"; # 30
+say score "5", "-2", "4", "C", "D", "9", "+", "+"; # 27
+say score "7", "D", "D", "C", "+", "3"; # 45
+say score "-5", "-10", "+", "D", "C", "+"; # -55
+say score "3", "6", "+", "D", "C", "8", "+", "D", "-2", "C", "+"; # 128
+
+sub score(*@list) {
+    my @stack;
+
+    for @list -> $item {
+        given $item {
+            when /\d/ {@stack.push($item)}
+            when 'C'  {@stack.pop if @stack}
+            when 'D'  {@stack.push(@stack[*-1] * 2) if @stack}
+            when '+'  {@stack.push((@stack[*-1] // 0) + (@stack[*-2] // 0))}
+        }
+    }
+
+    return [+] @stack;
+}