From 598422b9745ea871f161f2dcbfd883380ab706b1 Mon Sep 17 00:00:00 2001
From: Luis Mochan <mochan@fis.unam.mx>
Date: Mon, 8 Jan 2024 09:30:01 -0600
Subject: SOlve PWC251

---
 challenge-251/wlmb/blog.txt     |  1 +
 challenge-251/wlmb/perl/ch-1.pl | 14 ++++++++++++++
 challenge-251/wlmb/perl/ch-2.pl | 20 ++++++++++++++++++++
 3 files changed, 35 insertions(+)
 create mode 100644 challenge-251/wlmb/blog.txt
 create mode 100755 challenge-251/wlmb/perl/ch-1.pl
 create mode 100755 challenge-251/wlmb/perl/ch-2.pl

diff --git a/challenge-251/wlmb/blog.txt b/challenge-251/wlmb/blog.txt
new file mode 100644
index 0000000000..3c2c1d1653
--- /dev/null
+++ b/challenge-251/wlmb/blog.txt
@@ -0,0 +1 @@
+https://wlmb.github.io/2024/01/08/PWC251/
diff --git a/challenge-251/wlmb/perl/ch-1.pl b/challenge-251/wlmb/perl/ch-1.pl
new file mode 100755
index 0000000000..828c183030
--- /dev/null
+++ b/challenge-251/wlmb/perl/ch-1.pl
@@ -0,0 +1,14 @@
+#!/usr/bin/env perl
+# Perl weekly challenge 251
+# Task 1:  Concatenation Value
+#
+# See https://wlmb.github.io/2024/01/08/PWC251/#task-1-concatenation-value
+use v5.36;
+die <<~"FIN" unless @ARGV;
+    Usage: $0 N1 [N2...]
+    to concatenate and add the numbers N_1 . N_k + N_2 . N_{k-1} +...
+    FIN
+my $tot=0;
+my @ints=@ARGV;
+$tot += shift(@ints).(pop(@ints)//"") while(@ints);
+say "@ARGV -> $tot";
diff --git a/challenge-251/wlmb/perl/ch-2.pl b/challenge-251/wlmb/perl/ch-2.pl
new file mode 100755
index 0000000000..d835b0f63a
--- /dev/null
+++ b/challenge-251/wlmb/perl/ch-2.pl
@@ -0,0 +1,20 @@
+#!/usr/bin/env perl
+# Perl weekly challenge 251
+# Task 2:  Lucky Numbers
+#
+# See https://wlmb.github.io/2024/01/08/PWC251/#task-2-lucky-numbers
+use v5.36;
+use PDL;
+die <<~"FIN" unless @ARGV;
+    Usage: $0 A1 [A2...]
+    to find lucky numbers in the arrays A1, A2...
+    The format of the arrays should be "[[a00 a01...],[a10 a11...],...]",
+    to be read by pdl.
+    FIN
+while(@ARGV){
+    my $in=pdl(shift);
+    my $min=$in->minover->dummy(0);
+    my $max=$in->mv(1,0)->maxover->dummy(1);
+    my $result=$in->where(($in==$min)&($in==$max));
+    say "$in -> ", $result->isempty?-1:$result;
+}
-- 
cgit