Merge pull request #7314 from wlmb/challenges

Solve PWC197

3 files changed, 31 insertions, 0 deletions

diff --git a/challenge-197/wlmb/blog.txt b/challenge-197/wlmb/blog.txt
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+++ b/challenge-197/wlmb/blog.txt
@@ -0,0 +1 @@
+https://wlmb.github.io/2022/12/26/PWC197/
diff --git a/challenge-197/wlmb/perl/ch-1.pl b/challenge-197/wlmb/perl/ch-1.pl
new file mode 100755
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+++ b/challenge-197/wlmb/perl/ch-1.pl
@@ -0,0 +1,12 @@
+#!/usr/bin/env perl
+# Perl weekly challenge 197
+# Task 1:  Move Zero
+#
+# See https://wlmb.github.io/2022/12/26/PWC197/#task-1-move-zero
+use v5.36;
+say(<<~"FIN"), exit unless @ARGV;
+    Usage: $0 N1 [N2...]
+    to move all zeroes among the numbers N1, N2... towards the right,
+    keeping the order of the rest.
+    FIN
+say join " ", @ARGV, "->", sort {$a?$b?0:-1:1} @ARGV;
diff --git a/challenge-197/wlmb/perl/ch-2.pl b/challenge-197/wlmb/perl/ch-2.pl
new file mode 100755
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+++ b/challenge-197/wlmb/perl/ch-2.pl
@@ -0,0 +1,18 @@
+#!/usr/bin/env perl
+# Perl weekly challenge 197
+# Task 2:  Wiggle Sort
+#
+# See https://wlmb.github.io/2022/12/26/PWC197/#task-2-wiggle-sort
+use v5.36;
+use List::MoreUtils qw(any pairwise slide);
+say(<<~"FIN"), exit unless @ARGV;
+    Usage: $0 N1 [N2...]
+    to wiggle sort the numbers N1 N2...
+    FIN
+my @high=sort {$a <=> $b} @ARGV;
+my @low=reverse splice @high, 0, (@high+1)/2;
+@high=reverse @high;
+my $prev;
+my @out = grep {defined $_} pairwise {($a, $b)} @low, @high;
+my $failed=any {$_} slide {$a == $b} @out;
+say join " ", @ARGV, "->", $failed?"No solution":@out;