X-Git-Url: https://www.fi.muni.cz/~kas/git//home/kas/public_html/git/?a=blobdiff_plain;f=2022%2F39.pl;h=7f673d79e7f3f0a87a987360dfc87dc66d402708;hb=8bdd97e3fea3291fbc5eea1f20cafb1a7624ab81;hp=b60d35f1efe7363c4325220fe11a6b96e71bb282;hpb=5be58180676de7739990bb3a9d21ac65224e6903;p=aoc.git

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;