solution week 210-2

1 files changed, 40 insertions, 0 deletions

diff --git a/challenge-210/wambash/raku/ch-2.raku b/challenge-210/wambash/raku/ch-2.raku
new file mode 100644
index 0000000000..701d4c29be
--- /dev/null
+++ b/challenge-210/wambash/raku/ch-2.raku
@@ -0,0 +1,40 @@
+#!/usr/bin/env raku
+
+subset Pos of Int where * > 0;
+subset Neg of Int where * < 0;
+
+#multi number-colision-iter ((Neg $t,*@ll),(Neg $h,*@rl))                {      @ll, ($t,$h,|@rl) }
+multi number-colision-iter (  [Pos $t,*@ll], [Neg $h,*@rl] )  {
+    with $t <=> -$h {
+        when More { ($t,|@ll),     @rl  }
+        when Less {      @ll, ($h,|@rl) }
+        when Same {      @ll,      @rl  }
+    }
+}
+
+multi number-colision-iter (  @tll, [$h,*@rl] )  {($h,|@tll),        @rl}
+
+sub number-colision (+@list) {
+    ((),@list), {number-colision-iter |$_ } ... *[1] eq Empty
+    andthen .tail
+    andthen .[0]
+    andthen .reverse
+}
+
+multi MAIN (Bool :test($)!) {
+    use Test;
+    is number-colision-iter((2,), (3,-1)),((3,2),(-1,));
+    is number-colision-iter((3, 2), (-1,)),((3,2),());
+    is number-colision-iter((3, 2), (-4,)),((2,),(-4));
+    is number-colision-iter((2,), (-4,)),((),(-4));
+    is number-colision-iter((), (-4,)),((-4),());
+    is number-colision(2,3,-1),(2,3);
+    is number-colision(2,3,-4),(-4);
+    is number-colision(1,-1),();
+    is number-colision(3,2,-1,2,-1,-2,5,-4),(3,2,5);
+    done-testing;
+}
+
+multi MAIN (*@list) {
+    put number-colision @list
+}