Add solutions to PWC 106

3 files changed, 45 insertions, 0 deletions

diff --git a/challenge-106/wlmb/blog.txt b/challenge-106/wlmb/blog.txt
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+https://wlmb.github.io/2021/03/29/PWC106/
diff --git a/challenge-106/wlmb/perl/ch-1.pl b/challenge-106/wlmb/perl/ch-1.pl
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+++ b/challenge-106/wlmb/perl/ch-1.pl
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+#!/usr/bin/env perl
+# Perl weekly challenge 106
+# Task 1: Maximum gap
+#
+# See https://wlmb.github.io/2021/03/29/PWC106/#task-1-maximum-gap
+
+use strict;
+use warnings;
+use v5.12;
+use List::Util qw(reduce);
+
+my @sorted=sort {$a<=>$b} @ARGV;
+say +(reduce {$b>$a?$b:$a} map {$sorted[$_+1]-$sorted[$_]} 0..$#sorted-1)//0,
+    join ' ', '<-(', @ARGV, ')',
diff --git a/challenge-106/wlmb/perl/ch-2.pl b/challenge-106/wlmb/perl/ch-2.pl
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+++ b/challenge-106/wlmb/perl/ch-2.pl
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+#!/usr/bin/env perl
+# Perl weekly challenge 106
+# Task 2: Decimal String
+#
+# See https://wlmb.github.io/2021/03/29/PWC106/#task-2-decimal-string
+use strict;
+use warnings;
+use v5.12;
+use integer;
+use List::Util qw(all);
+use POSIX qw(floor);
+
+my ($numerator, $denominator)= @ARGV;
+die "Usage: ./ch-2.pl numerator denominator"
+    unless defined $numerator and defined $denominator;
+# I assume positive integer numbers.
+my $integer=$numerator/$denominator;
+my $rest=$numerator%$denominator;
+my %seen;
+my $start=0;
+my @digits;
+while($rest && !defined $seen{$rest}){
+    $seen{$rest}=$start++;
+    push @digits, (10*$rest)/$denominator;
+    $rest=(10*$rest)%$denominator;
+}
+$seen{0}=$start;
+my $result=join '', "$integer.", @digits[0..$seen{$rest}-1];
+$result.=join '', '(', @digits[$seen{$rest}..$#digits], ')' if $rest!=0;
+say "$numerator/$denominator=$result";