1 files changed, 17 insertions, 0 deletions
diff --git a/009/ch1.pl b/009/ch1.pl
new file mode 100755
index 0000000..e98223d
--- /dev/null
+++ b/009/ch1.pl
@@ -0,0 +1,17 @@
+#!/usr/bin/env perl
+
+use strict;
+use warnings;
+
+# Compute distinct digits of the given number
+sub distinct {
+    my $n = shift;
+    my %uniq; # Poor man's set
+    $uniq{$_} = 1 foreach split(//, $n);
+    return keys %uniq;
+}
+
+my $n = 0;
+$n++ while distinct($n**2) != 5;
+
+print "$n ($n**2 = ", $n**2, ")\n";