From 8bdd97e3fea3291fbc5eea1f20cafb1a7624ab81 Mon Sep 17 00:00:00 2001
From: "Jan \"Yenya\" Kasprzak" <kas@fi.muni.cz>
Date: Tue, 20 Dec 2022 10:18:17 +0100
Subject: [PATCH] Day 20: alternative solution wit list of pairs - slower but
 prettier

---
 2022/39.pl | 25 +++++++++++--------------
 2022/40.pl | 26 +++++++++++---------------
 2 files changed, 22 insertions(+), 29 deletions(-)

diff --git a/2022/39.pl b/2022/39.pl
index b60d35f..7f673d7 100755
--- a/2022/39.pl
+++ b/2022/39.pl
@@ -3,27 +3,24 @@
 use v5.36;
 use strict;
 
-chomp(my @list = <>);
-my @perm = ( 0 .. $#list );
+my $i = 0;
+my @list = map { chomp; [$i++, $_] } <>;
 
 for my $idx (0 .. $#list) {
-	my $move = $list[$idx];
-	my $pos = 0;
-	$pos++ while $perm[$pos] != $idx;
-	splice(@perm, $pos, 1);
-	my $dst = ($pos + $move) % @perm;
-	splice(@perm, $dst, 0, $idx);
+	my $i = 0;
+	$i++ while $list[$i][0] != $idx;
+	my $item = splice @list, $i, 1;
+	my $dest = ($item->[1] + $i) % @list;
+	splice @list, $dest, 0, $item;
 }
 
-my @ordered = map { $list[$perm[$_]] } 0 .. $#list;
-
-my $i = 0;
-$i++ while $ordered[$i] != 0;
+$i = 0;
+$i++ while $list[$i][1] != 0;
 my $sum;
 for (1 .. 3) {
 	$i += 1000;
-	$i %= @ordered;
-	$sum += $ordered[$i];
+	$i %= @list;
+	$sum += $list[$i][1];
 }
 
 say $sum;
diff --git a/2022/40.pl b/2022/40.pl
index b6e9ff4..5451455 100755
--- a/2022/40.pl
+++ b/2022/40.pl
@@ -4,30 +4,26 @@ use v5.36;
 use strict;
 
 my $key = 811589153;
-my @list = map { $key * $_ } <>;
-my @perm = ( 0 .. $#list );
+my $i = 0;
+my @list = map { [$i++, $key * $_] } <>;
 
 for (1 .. 10) {
 	for my $idx (0 .. $#list) {
-		my $move = $list[$idx];
-		my $pos = 0;
-		$pos++ while $perm[$pos] != $idx;
-		splice(@perm, $pos, 1);
-		my $dst = ($pos + $move) % @perm;
-		splice(@perm, $dst, 0, $idx);
+		my $i = 0;
+		$i++ while $list[$i][0] != $idx;
+		my $item = splice @list, $i, 1;
+		my $dest = ($item->[1] + $i) % @list;
+		splice @list, $dest, 0, $item;
 	}
 }
 
-my @ordered = map { $list[$perm[$_]] } 0 .. $#list;
-
-my $i = 0;
-$i++ while $ordered[$i] != 0;
-
+$i = 0;
+$i++ while $list[$i][1] != 0;
 my $sum;
 for (1 .. 3) {
 	$i += 1000;
-	$i %= @ordered;
-	$sum += $ordered[$i];
+	$i %= @list;
+	$sum += $list[$i][1];
 }
 
 say $sum;
-- 
2.43.5