From d2312baf5bea9bb603352b10410cb82f9c3e2e49 Mon Sep 17 00:00:00 2001
From: Yanick Champoux <yanick@babyl.dyndns.org>
Date: Wed, 14 Feb 2018 12:31:28 -0500
Subject: [PATCH] 2016-12

---
 2016/12/1.pl      | 59 +++++++++++++++++++++++++++++++++++++++++++++++
 2016/12/input.txt | 23 ++++++++++++++++++
 2 files changed, 82 insertions(+)
 create mode 100644 2016/12/1.pl
 create mode 100644 2016/12/input.txt

diff --git a/2016/12/1.pl b/2016/12/1.pl
new file mode 100644
index 0000000..0537474
--- /dev/null
+++ b/2016/12/1.pl
@@ -0,0 +1,59 @@
+use 5.20.0;
+
+undef $/;
+my $code = <>;
+
+$code =~ s/\b([a-d])\b/\$$1/g;
+
+$code =~ s/cpy (\S+) (\S+)/$2 = $1/g;
+
+$code =~ s/inc (\S+)/$1++/g;
+$code =~ s/dec (\S+)/$1--/g;
+
+
+my $i = 1;
+$code =   
+    join "\n",
+    map { $_->[1] }
+    map { 
+        $_->[1] =~ s/jnz (\S+) (\S+)/"if($1){ goto LINE_" . ( $_->[0] + $2 ) . "}"/e;
+        $_ } 
+    map { $_->[1] = "LINE_" . $_->[0] . ': ' . $_->[1]; $_ }
+    map { [ $i++, $_ ] } grep { length } split /\n/, $code;
+
+$code =~ s/$/;/mg;
+
+my( $c, $d) = ( 1,0);
+eval $code;
+
+die $@ if $@;
+
+say $a;
+
+__END__
+use Scalar::Util qw/ looks_like_number /;
+
+my $i  = 0;
+my @instructions = map { "LINE_" . $i++ . ': ' . $_ } <>;
+
+
+my %reg;
+
+while ( my $c = $instructions[$i++] ) {
+    say $i;
+    use DDP;
+    p %reg;
+    if( $c =~ /cpy (\S+) (.)/ ) {
+        $reg{$2} = looks_like_number($1) ? $1 : $reg{$1};
+    }
+    elsif ( $c =~ /(inc|dec) (.)/ ) {
+        $reg{$2} += ($1 eq 'inc') ? 1 : -1;
+    }
+    elsif( $c =~ /jnz (.) (.*)/ ) {
+        $i += -1 + $2 if $reg{$1};
+    }
+    else { die }
+    my $x = <STDIN>;
+}
+
+say $reg{a};
diff --git a/2016/12/input.txt b/2016/12/input.txt
new file mode 100644
index 0000000..3729d83
--- /dev/null
+++ b/2016/12/input.txt
@@ -0,0 +1,23 @@
+cpy 1 a
+cpy 1 b
+cpy 26 d
+jnz c 2
+jnz 1 5
+cpy 7 c
+inc d
+dec c
+jnz c -2
+cpy a c
+inc a
+dec b
+jnz b -2
+cpy c b
+dec d
+jnz d -6
+cpy 19 c
+cpy 11 d
+inc a
+dec d
+jnz d -2
+dec c
+jnz c -5