Create ch-1.pl

1 files changed, 22 insertions, 0 deletions

diff --git a/challenge-211/james-smith/perl/ch-1.pl b/challenge-211/james-smith/perl/ch-1.pl
new file mode 100644
index 0000000000..c62df391d1
--- /dev/null
+++ b/challenge-211/james-smith/perl/ch-1.pl
@@ -0,0 +1,22 @@
+#!/usr/local/bin/perl
+
+use strict;
+use warnings;
+use feature qw(say);
+use Test::More;
+
+my @TESTS = (
+  [ [[4,3,2,1],[5,4,3,2],[6,5,4,3]], 1 ],
+  [ [[1,2,3],[3,2,1]],               0 ],
+);
+
+sub toeplitz {
+  return if @_ > @{$_[0]}; ## unclear but no diagonals..
+  my @st = @{$_[0]}[ 0 .. @{$_[0]} - @_ ];
+  for my $r ( 1 .. $#_ ) {
+    $st[$_] == $_[$r][$r+$_] || return 0 for 0 .. $#st;
+  }
+  1
+}
+
+is( toeplitz( @{$_->[0]} ), $_->[1] ) for @TESTS;