add day 5

2 files changed, 1426 insertions, 0 deletions

diff --git a/5-input.txt b/5-input.txt
new file mode 100644
index 0000000..6c28765
--- /dev/null
+++ b/5-input.txt
@@ -0,0 +1,1377 @@
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diff --git a/5.pl b/5.pl
new file mode 100644
index 0000000..1c8db1a
--- /dev/null
+++ b/5.pl
@@ -0,0 +1,49 @@
+#!/usr/bin/env perl
+
+$ordering_rules = [];
+$updates = [];
+open($fh, "5-input.txt") or die ;
+while (<$fh>) {
+  chomp;
+  if (m/(\d+)\|(\d+)/) { push @$ordering_rules, [$1, $2]; }
+  elsif (m/^\d+,\d+/) { push @$updates, [split(/,/, $_)]; }
+}
+close($fh);
+
+$sum_no_order = 0;
+$sum_order = 0;
+
+for($x=0; $x<scalar @$updates; $x++) {
+  if (in_order($ordering_rules, $updates->[$x])) {
+    $sum_no_order=$sum_no_order+@{$updates->[$x]}[scalar @{$updates->[$x]} / 2];
+  } else {
+    @{$updates->[$x]} = sort {
+      foreach (@$ordering_rules) {
+        if ($_->[0] == $a and $_->[1] == $b) { return -1; }
+        elsif ($_->[1] == $a and $_->[0] == $b) { return 1; }
+      }
+      return 0;
+    } @{$updates->[$x]};
+    $sum_order=$sum_order+@{$updates->[$x]}[scalar @{$updates->[$x]} / 2];
+  }
+}
+
+print "puzzle 1: $sum_no_order\n";
+print "puzzle 2: $sum_order\n";
+
+sub in_order {
+  my ($i, $j) = @_;
+  for(my $k=0; $k < scalar @$j; $k++) { return 0 if not in_order_idx($i, $j, $k); }
+  return 1;
+}
+
+sub in_order_idx {
+  my ($i, $j, $k) = @_;
+  for (my $x=$k+1; $x<scalar @$j; $x++) {
+    for(my $z=0; $z<scalar @$i; $z++) {
+      return 0 if @{$i->[$z]}[0] eq $j->[$x] and @{$i->[$z]}[1] eq $j->[$k];
+    }
+  }
+
+  return 1;
+}