2 files changed, 32 insertions, 0 deletions
diff --git a/challenge-102/feng-chang/raku/ch-1.raku b/challenge-102/feng-chang/raku/ch-1.raku
new file mode 100755
index 0000000000..463aa8f413
--- /dev/null
+++ b/challenge-102/feng-chang/raku/ch-1.raku
@@ -0,0 +1,17 @@
+#!/bin/env raku
+
+sub is-square(UInt:D \N --> Bool:D) {
+    my UInt $n = N.sqrt.UInt;
+    N == $n * $n;
+}
+
+sub MAIN(UInt:D \N) {
+    my UInt $min = ('1' ~ '0' x N-1).UInt;
+    my UInt $max = ('9' x N).UInt;
+    for $min..$max -> $m {
+        my UInt $n = $m.flip.UInt;
+        next if $n > $m;
+
+        put $m if is-square($m + $n) and is-square($m - $n);
+    }
+}
diff --git a/challenge-102/feng-chang/raku/ch-2.raku b/challenge-102/feng-chang/raku/ch-2.raku
new file mode 100755
index 0000000000..394fede9ae
--- /dev/null
+++ b/challenge-102/feng-chang/raku/ch-2.raku
@@ -0,0 +1,15 @@
+#!/bin/env raku
+
+sub MAIN(UInt:D \N) {
+    my Str:D  $s   = '#';
+    my UInt:D $pos = N;
+
+    while $s.chars < N {
+        $s   = $pos ~ $s;
+        $pos = N - $s.chars;
+
+        $s = '#' ~ $s if $s.chars < N;
+    }
+
+    put $s;
+}