From be86313559dad2edb330caed8febf8382f1128ed Mon Sep 17 00:00:00 2001
From: Jörg Sommrey <28217714+jo-37@users.noreply.github.com>
Date: Fri, 22 Dec 2023 11:53:45 +0100
Subject: Solution to task 1

---
 challenge-248/jo-37/perl/ch-1.pl | 65 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100755 challenge-248/jo-37/perl/ch-1.pl

diff --git a/challenge-248/jo-37/perl/ch-1.pl b/challenge-248/jo-37/perl/ch-1.pl
new file mode 100755
index 0000000000..43dd5d5a8f
--- /dev/null
+++ b/challenge-248/jo-37/perl/ch-1.pl
@@ -0,0 +1,65 @@
+#!/usr/bin/perl -s
+
+use v5.24;
+use Test2::V0 '!float';
+use PDL;
+use PDL::Char;
+
+our ($tests, $examples, $char);
+
+run_tests() if $tests || $examples;	# does not return
+
+die <<EOS unless defined $char && @ARGV == 1;
+usage: $0 [-examples] [-tests] [-char=C S]
+
+-examples
+    run the examples from the challenge
+ 
+-tests
+    run some tests
+
+-char=C
+    find distances to character C within the given string S
+
+S
+    a string
+
+EOS
+
+
+### Input and Output
+
+say shortest_distance($char, shift);
+
+
+### Implementation
+
+sub shortest_distance {
+    my $c = PDL::Char->new(shift);
+    my $s = PDL::Char->new(shift);
+    my $p = which($s == $c)->long;
+    return if $p->isempty;
+
+	minover abs sequence(1, $s->dim(0)) - $p;
+}
+
+
+### Examples and tests
+
+sub run_tests {
+    SKIP: {
+        skip "examples" unless $examples;
+
+        is shortest_distance('e', 'loveleetcode')->unpdl,
+            [3,2,1,0,1,0,0,1,2,2,1,0], 'example 1';
+        is shortest_distance('b', 'aaab')->unpdl,
+            [3,2,1,0], 'example 2';
+    }
+
+    SKIP: {
+        skip "tests" unless $tests;
+	}
+
+    done_testing;
+    exit;
+}
-- 
cgit 


From 7a8aa4dc644c01420bb3aa7d2322f4ca23f63999 Mon Sep 17 00:00:00 2001
From: Jörg Sommrey <28217714+jo-37@users.noreply.github.com>
Date: Fri, 22 Dec 2023 11:54:05 +0100
Subject: Solution to task 2

---
 challenge-248/jo-37/perl/ch-2.pl | 69 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100755 challenge-248/jo-37/perl/ch-2.pl

diff --git a/challenge-248/jo-37/perl/ch-2.pl b/challenge-248/jo-37/perl/ch-2.pl
new file mode 100755
index 0000000000..ee94250365
--- /dev/null
+++ b/challenge-248/jo-37/perl/ch-2.pl
@@ -0,0 +1,69 @@
+#!/usr/bin/perl -s
+
+use v5.24;
+use Test2::V0 '!float';
+use PDL;
+use PDL::NiceSlice;
+
+our ($tests, $examples);
+
+run_tests() if $tests || $examples;	# does not return
+
+die <<EOS unless @ARGV;
+usage: $0 [-examples] [-tests] [--] [M]
+
+-examples
+    run the examples from the challenge
+ 
+-tests
+    run some tests
+
+M
+    a matrix in any format as accepted by the PDL string constructor,
+    e.g. '1,0,0;0,1,0;0,0,1'
+
+EOS
+
+
+### Input and Output
+
+say submatrix_sum("@ARGV");
+
+
+### Implementation
+
+sub submatrix_sum {
+	my $m = pdl @_;
+
+    $m->range(ndcoords($m(1:,1:)), 2)->reorder(2, 3, 0, 1)
+        ->clump(2)->sumover;
+}
+
+
+### Examples and tests
+
+sub run_tests {
+    SKIP: {
+        skip "examples" unless $examples;
+
+        is submatrix_sum(
+            [1,  2,  3,  4],
+            [5,  6,  7,  8],
+            [9, 10, 11, 12])->unpdl,
+            [[14, 18, 22], [30, 34, 38]], 'example 1';
+
+        is submatrix_sum(
+            [1, 0, 0, 0],
+            [0, 1, 0, 0],
+            [0, 0, 1, 0],
+            [0, 0, 0, 1])->unpdl,
+            [[2, 1, 0], [1, 2, 1], [0, 1, 2]], 'example 2';
+    }
+
+    SKIP: {
+        skip "tests" unless $tests;
+	}
+
+    done_testing;
+    exit;
+}
-- 
cgit 


From 80e513fd115dfe276c6c2ebbbe325ac12d1e9e60 Mon Sep 17 00:00:00 2001
From: Jörg Sommrey <28217714+jo-37@users.noreply.github.com>
Date: Fri, 22 Dec 2023 11:54:55 +0100
Subject: Blog for challenge 248

---
 challenge-248/jo-37/blog.txt | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 challenge-248/jo-37/blog.txt

diff --git a/challenge-248/jo-37/blog.txt b/challenge-248/jo-37/blog.txt
new file mode 100644
index 0000000000..1cba0eaabc
--- /dev/null
+++ b/challenge-248/jo-37/blog.txt
@@ -0,0 +1 @@
+https://github.sommrey.de/blog/pwc/challenge-248
-- 
cgit