ash 77-2

2 files changed, 37 insertions, 0 deletions

diff --git a/challenge-077/ash/blog1.txt b/challenge-077/ash/blog1.txt
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index 0000000000..a81f60f4d3
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+++ b/challenge-077/ash/blog1.txt
@@ -0,0 +1 @@
+https://andrewshitov.com/2020/09/08/lonely-x-the-weekly-challenge-77-task-2/
diff --git a/challenge-077/ash/raku/ch-2.raku b/challenge-077/ash/raku/ch-2.raku
new file mode 100644
index 0000000000..47d8524eaa
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+++ b/challenge-077/ash/raku/ch-2.raku
@@ -0,0 +1,36 @@
+#!/usr/bin/env raku
+
+# Task 2 from
+# https://perlweeklychallenge.org/blog/perl-weekly-challenge-077/
+
+# Comments: https://andrewshitov.com/2020/09/08/lonely-x-the-weekly-challenge-77-task-2/
+
+my @matrix =
+    < O O X >,
+    < X O O >,
+    < X O O >; # square matrix
+
+# my @matrix =
+#     < O O X O >,
+#     < X O O O >,
+#     < X O O X >,
+#     < O X O O >;
+
+my @neighbours = ([X] (-1, 0, 1) xx 2).grep(*.all != 0);
+
+for ^@matrix X ^@matrix -> @coord {
+    next if @matrix[@coord[0]][@coord[1]] eq 'O';
+
+    @coord.put if all((@neighbours.map(* <<+>> @coord)).grep(0 <= *.all <= @matrix.end).map({        
+        @matrix[$_[0]][$_[1]] eq 'O';
+    }));
+}
+
+# Output:
+# $ raku ch-2.raku 
+# 0 2
+
+# Or:
+# $ raku ch-2.raku 
+# 0 2
+# 2 3