2 files changed, 34 insertions, 0 deletions
diff --git a/challenge-191/feng-chang/raku/ch-1.raku b/challenge-191/feng-chang/raku/ch-1.raku
new file mode 100755
index 0000000000..cfab573b2e
--- /dev/null
+++ b/challenge-191/feng-chang/raku/ch-1.raku
@@ -0,0 +1,6 @@
+#!/bin/env raku
+
+unit sub MAIN(*@N);
+
+my \m = @N.max;
+put @N.grep(!(* == m)).any * 2 > m ?? -1 !! 1;
diff --git a/challenge-191/feng-chang/raku/ch-2.raku b/challenge-191/feng-chang/raku/ch-2.raku
new file mode 100755
index 0000000000..7d6b0ae4b8
--- /dev/null
+++ b/challenge-191/feng-chang/raku/ch-2.raku
@@ -0,0 +1,28 @@
+#!/bin/env raku
+
+unit sub MAIN(UInt:D \n where * > 0);
+
+sub solve(@S is copy, @s is copy) {
+    return 0 if +@S == 0;
+    return 0 if +@S.any == 0;
+
+    #return +@S[0] if +@S == 1;
+    if +@S == 1 {
+        put ' ', (|@s, |@S[0]).join(' ');
+        return +@S[0];
+    }
+
+    my \n = @S[0].shift;
+    my \cnt = solve(@S, @s);
+
+    @S.shift;
+    @S .= map({ $_.grep(!(* == n)).Array });
+    @s.push(n);
+
+    cnt + solve(@S, @s)
+}
+
+my @S = (1..n).map(-> \m { (1..n).grep({ m %% $_ or $_ %% m }).Array });
+put "candidates: {@S.gist}";
+
+put solve(@S, []);