add rest HEAD master

30 files changed, 7550 insertions, 0 deletions

diff --git a/day05.rb b/day05.rb
new file mode 100644
index 0000000..ce5fd2e
--- /dev/null
+++ b/day05.rb
@@ -0,0 +1,21 @@
+t = s = File.read("day05").chomp
+
+v = ('a'..'z').map { |l| ["#{l}#{l.upcase}", "#{l.upcase}#{l}"] }.flatten
+r = Regexp.union v
+
+p r
+
+while s.gsub!(r, '')
+end
+
+p s.size
+
+# 9687 too high
+
+p ('a'..'z').map { |l|
+  s = t.delete "#{l}#{l.upcase}"
+  while s.gsub!(r, '')
+  end
+  p [l, s.size]
+  s.size
+}.min
diff --git a/day07.k b/day07.k
new file mode 100644
index 0000000..ebb0a13
--- /dev/null
+++ b/day07.k
@@ -0,0 +1,14 @@
+ +(1:`day07)@'/:5,36
+
+/ d[;36]@=(d:1:`day07)[;5]
+m: d[;5]@=(d:1:`day07)[;36]
+
+s: ?(,/m)^m
+
+
+ m: d[;5]@=(d:1:`day07)[;36]
+ m:{x@<x}'m
+
+s: (!m)^(,/m)
+
+/ wrong BDNGEVOQYHLWXPSUAMZJIKRTFC
\ No newline at end of file
diff --git a/day08.k b/day08.k
new file mode 100644
index 0000000..4770580
--- /dev/null
+++ b/day08.k
@@ -0,0 +1,3 @@
+d:2 3 0 3 10 11 12 1 1 0 1 99 2 1 1 2
+
+t:{}
\ No newline at end of file
diff --git a/day08.rb b/day08.rb
new file mode 100644
index 0000000..a51543b
--- /dev/null
+++ b/day08.rb
@@ -0,0 +1,43 @@
+d=File.read("day08").split.map(&:to_i)
+
+def t(d)
+  return 0  if d.empty?
+
+  len = d.shift
+  md = d.shift
+
+  mds = 0
+  (0...len).map {
+    mds += t(d)
+  }
+  mds += d.shift(md).sum
+end
+
+def s(d)
+  return 0  if d.empty?
+
+  len = d.shift
+  md = d.shift
+
+  mds = (0...len).map {
+    s(d)
+  }
+  
+  m = d.shift(md)
+
+  if len == 0
+    m.sum
+  else
+    m.map { |i|
+      if i <=0 || i > mds.size
+        0
+      else
+        mds[i-1]
+      end
+    }.sum
+  end
+end
+
+p t(d.clone)  # 35852
+p s(d.clone)  # 33422
+
diff --git a/day09.rb b/day09.rb
new file mode 100644
index 0000000..ed76465
--- /dev/null
+++ b/day09.rb
@@ -0,0 +1,54 @@
+s = [0]
+
+m = 1
+i = 0
+
+mp = 9
+mr = 25
+
+mp = 10
+mr = 1618
+=begin
+
+mp = 13
+mr = 7999
+
+mp, mr =  File.read("day09").scan(/\d+/).map(&:to_i)
+mr *= 100  # part 2
+
+p mr
+=end
+
+scores = Hash.new(0)
+
+catch(:done) {
+loop {
+  (1..mp).each { |p|
+    print m, " ", i, " ", s.size, " "
+    p s
+
+    if m % 23 == 0
+      scores[p] += m
+      print "score1 #{p} #{m}\n"
+      i = (i - 8) % s.size
+      print "score2 #{p} #{s[i]}\n"
+      scores[p] += s.delete_at(i)
+      
+      i = (i+1)%s.size
+      m += 1
+    else
+      i += 1
+      s.insert(i, m)
+      i = (i+1)%s.size
+      m += 1
+    end
+
+    p m  if m % 100000 == 0
+
+    throw :done if m >= mr+1
+  }
+}
+}
+
+p scores
+p scores.values.max  # 382055
diff --git a/day11.k b/day11.k
new file mode 100644
index 0000000..e2b88f9
--- /dev/null
+++ b/day11.k
@@ -0,0 +1,6 @@
+d:7857
+v:{{-5+`i$x[2]}@|$r*d+(*|x)*r:*:x+10}''300 300#+!300 300
+","/:'$1_'{x[2,*>x]}@{s::x;({x@*>x}@{(+/(v .)'+x+!2#s),x,s}'+!2#300-s)}'1+!22
+
+/ 243,16
+/ 231,227,14
diff --git a/day12 b/day12
new file mode 100644
index 0000000..1ca818c
--- /dev/null
+++ b/day12
@@ -0,0 +1,34 @@
+initial state: ##.####..####...#.####..##.#..##..#####.##.#..#...#.###.###....####.###...##..#...##.#.#...##.##..
+
+##.## => #
+....# => .
+.#.#. => #
+..### => .
+##... => #
+##### => .
+###.# => #
+.##.. => .
+..##. => .
+...## => #
+####. => .
+###.. => .
+.#### => #
+#...# => #
+..... => .
+..#.. => .
+#..## => .
+#.#.# => #
+.#.## => #
+.###. => .
+##..# => .
+.#... => #
+.#..# => #
+...#. => .
+#.#.. => .
+#.... => .
+##.#. => .
+#.### => .
+.##.# => .
+#..#. => #
+..#.# => .
+#.##. => #
diff --git a/day12.rb b/day12.rb
new file mode 100644
index 0000000..288d34f
--- /dev/null
+++ b/day12.rb
@@ -0,0 +1,79 @@
+s="#..#.#..##......###...###"
+
+t = {
+"...##"=>"#",
+"..#.."=>"#",
+".#..."=>"#",
+".#.#."=>"#",
+".#.##"=>"#",
+".##.."=>"#",
+".####"=>"#",
+"#.#.#"=>"#",
+"#.###"=>"#",
+"##.#."=>"#",
+"##.##"=>"#",
+"###.."=>"#",
+"###.#"=>"#",
+"####."=>"#",
+}
+
+s="##.####..####...#.####..##.#..##..#####.##.#..#...#.###.###....####.###...##..#...##.#.#...##.##.."
+
+t={
+"##.##"=>"#",
+"....#"=>".",
+".#.#."=>"#",
+"..###"=>".",
+"##..."=>"#",
+"#####"=>".",
+"###.#"=>"#",
+".##.."=>".",
+"..##."=>".",
+"...##"=>"#",
+"####."=>".",
+"###.."=>".",
+".####"=>"#",
+"#...#"=>"#",
+"....."=>".",
+"..#.."=>".",
+"#..##"=>".",
+"#.#.#"=>"#",
+".#.##"=>"#",
+".###."=>".",
+"##..#"=>".",
+".#..."=>"#",
+".#..#"=>"#",
+"...#."=>".",
+"#.#.."=>".",
+"#...."=>".",
+"##.#."=>".",
+"#.###"=>".",
+".##.#"=>".",
+"#..#."=>"#",
+"..#.#"=>".",
+"#.##."=>"#",
+}
+
+s = ("."*1000) + s + (".")*1000
+
+r = 0
+(1..1000).each { |i|
+  s = "..#{s}..".chars.each_cons(5).map { |c|
+    t[c.join] || "."
+  }.join
+
+  if i == 20 || i == 500 || i == 1000
+    r = 0
+    s.chars.each_with_index { |c, i|
+      if c == "#"
+        #    p i-10
+        r += i-1000
+      end
+    }
+    
+    p [i,r]
+  end
+}
+
+# 1000..2000 adds up to 32000
+p r + ((50000000000/1000)-1)*32000  # 1600000032081
diff --git a/day13 b/day13
new file mode 100644
index 0000000..e6855b9
--- /dev/null
+++ b/day13
@@ -0,0 +1,150 @@
+                                                      /------------------------------------------------------------------------------------------\    
+                                /---------------------+---------------------------------------------\                                            |    
+           /--------------------+---------------------+--------------------------------\            |                      /------------\        |    
+           |                    |                 /---+--------------------------------+------------+----------------------+------------+--------+---\
+           |/-------------------+-----------------+---+\                /--------------+---------\  |                      |            |        |   |
+    /------++-----------\       |                 |   ||      /---------+\             |         |  |                      |            |        |   |
+    |      ||           |       |          /------+---++------+---------++-------------+---------+--+-----\                |            |        |   |
+    |      ||           |       |          |      |/--++------+---------++-------\   /-+--------\|  |     |                |            |        |   |
+    |      ||   /-------+-------+----------+\     ||  ||      |         ||       |   | |        ||  |     |                |            |        |   |
+    |    /-++---+-------+-----\ |/---------++-----++--++------+---------++-------+---+-+--------++--+-----+-----------\    |            |        |   |
+    |    | ||   |       |     | ||     /---++-----++--++------+---------++-------+---+-+\       ||  |     |           |    |            |        |   |
+    |    | ||   |       |     | ||     |   ||     ||  ||      |         ||/------+---+-++-------++--+-----+-----------+----+-\          |        |   |
+    |    | ||   |       |     | ||     |   ||    /++--++------+---------+++------+---+-++-------++--+-----+--\        |    | |          |        |   |
+   /+----+-++---+-------+-----+-++-----+---++----+++--++->----+---------+++------+-\ | ||       ||  |     |  |        |    | |          |        |   |
+   ||    | ||   |/------+-----+-++-----+---++----+++--++------+---------+++------+-+-+-++-------++--+-----+--+-------\|    | |          |        |   |
+   ||    | ||   ||      |     | ||     |   ||    |||  ||      |         |||      | | | ||    /--++--+-----+--+-------++----+-+---\      |        |   |
+   ||    | ||   ||      |     | ||     | /-++----+++--++----\ |         |||      | | | ||    |  ||  |     |  |       ||    | |   |      |        |   |
+   || /--+-++---++------+-----+-++-----+-+-++----+++--++----+-+---------+++---\  | | | ||    |  ||  |     |  |       ||    | |   |      |        |   |
+   || |  \-++---++------+-----/ ||     | | ||    |||/-++----+-+---------+++---+--+-+-+-++----+--++--+-----+-\|       ||    | |   |  /---+--------+--\|
+   || |    ||   ||      |       ||    /+-+-++----++++-++----+-+---------+++---+--+-+-+-++----+--++--+-----+\||     /-++----+-+-\ |  |   |        |  ||
+   || |    ||   ||      |       ||  /-++-+-++----++++-++----+-+---------+++---+--+-+-+-++----+--++--+-----++++-\   | ||    | | | |  |   |        |  ||
+   || |    ||   ||      |       ||  | || | ||    |||| ||    | |         ||\---+--+-+-+-++----+--++--+-----++++-+---+-++----+-/ | |  |   |        |  ||
+   || |    ||   ||      |       ||  | || | ||    |||| ||    |/+---------++----+--+-+-+-++----+--++--+---\ |||| |   | ||    |   | |  |  /+-------\|  ||
+   || |    ||   ||      |       ||  | || | ||    |||| ||    |||         ||    |/-+-+-+-++----+--++--+---+-++++-+---+-++-\  |   | |  |  ||       ||  ||
+   || |    ||   ||      |       ||  | || | ||/---++++-++----+++---------++----++-+-+-+-++----+--++--+---+-++++-+---+-++-+\ |   | |  |  ||       ||  ||
+   || |    ||   ||  /---+-------++--+-++-+-+++---++++-++----+++---------++----++-+-+-+-++----+--++--+---+-++++-+---+-++-++-+-\ | |  |  ||       ||  ||
+  /++-+----++---++--+---+--\    ||  | || | |||   |||| ||    |||         ||    || | | | ||    |/-++--+---+-++++-+---+-++-++-+-+-+-+--+--++\      ||  ||
+  ||| |    ||   ||  |   |  |    ||  | || | \++---++++-++----+++---------++----++-+-+-+-++----++-++--+---+-/||| |/--+-++-++-+-+-+-+--+--+++---\  ||  ||
+  ||| |/---++---++--+---+--+----++\ | || |  ||   |||| ||    |||         \+----++-+-+-+-++----++-+/  |   |  ||| ||  | || || | | | |  |  |||   |  ||  ||
+  ||| ||   ||  /++--+---+--+----+++-+-++-+--++---++++-++----+++----------+----++-+-+-+\||    || |   |   |  ||| ||/-+-++-++-+-+-+-+--+--+++---+--++-\||
+  ||| ||   ||  |||  |   |  |    ||| | || |  ||   |||| ||    |||      /---+----++-+-+-++++----++-+---+---+--+++-+++-+-++-++-+-+-+-+--+-<+++---+\ || |||
+  ||| ||/--++--+++-\|   |  |    ||| | || |  ||   |||\-++----+++------+---+----++-+-+-++++----++-+---+---+--+/| ||| \-++-++-+-+-/ |  |  |||   || || |||
+  ||| |||  ||/-+++-++-\ | /+----+++-+-++-+--++---+++--++----+++------+---+----++-+-+-++++----++-+---+---+--+-+-+++---++-++\| |   |  |  |||   || || |||
+  ||| |||  ||| ||| || | | ||    ||| | || |  ||   |||  || /--+++------+---+----++-+\| ||||    || |   |   |  | | |||   || |||| |   |  |  |||   || || |||
+  ||| |||  ||| ||| || | | ||    ||| | || |  ||   |\+--++-+--+++------+---+----++-+++-++++----++-+---+---+--+-+-+++---++-++++-+---+--+--+++->-++-++-++/
+  ||| |||  ||| ||| || | | ||    ||| | || |/-++---+-+--++-+--+++->----+---+----++-+++-++++----++-+---+---+--+-+-+++---++-++++-+---+\ |  |||   || || || 
+  ||| |||  ||| ||| || | | ||    ||| | || ||/++---+-+--++-+--+++------+---+----++-+++-++++----++-+---+---+--+-+-+++---++-++++-+---++-+--+++---++\|| || 
+  |\+-+++--+++-+++-++-+-+-++----+++-+-++-+++++---+-+--++-+--+++------+---+----++-++/ ||||    || |   |   |  | | |||   || |||| |   || |  |||   ||||| || 
+  | | |||  ||| ||\-++-+-+-++----+++-+-++-+++++---+-+--++-+--+++------+---+----++-++--++++----++-+---+---+--+-+-+++---/| |||| |   || |  |||   ||||| || 
+  | | |||  ||| ||/-++-+-+-++----+++\| || \++++---+-+--++-+--/||      |   |    || ||  ||||    || |   |   |  | | |||    | |||| |   || |  |||   ||||| || 
+  | | |||  ||| ||| || | | ||    ||||| ||/-++++---+-+--++-+---++------+---+----++-++--++++----++-+---+---+--+-+\|||    | |||| |   || |  |||   ||||| || 
+  | | |||  ||| |||/++-+-+-++--\ ||||| ||| ||||  /+-+--++-+---++------+---+----++-++--++++--\ || |   |   |  | |||||    | |||| |   || |  |||   ||||| || 
+  | | |||  ||| |||||| | | ||  | ||||| ||| ||||  || |  || |   ||      |   |    |\-++--++++--+-++-+---+---+--+-+++++----+-/||| |   || |  |||   ||||| || 
+  | | |||  ||| |||||^ | | ||  | ||||| ||| ||||  || |  \+-+---++------+---+----+--++--++++--+-++-+---+---+--+-+++++----+--+++-+---++-+--+++---++++/ || 
+  |/+-+++--+++-++++++-+-+-++--+-+++++-+++-++++--++-+---+-+---++------+---+----+--++--++++--+-++-+---+---+\ | |||||    |  ||| |   || |  |||   ||||  || 
+  ||| |||  ||| |||||| | | ||  | |||||/+++-++++--++-+---+-+---++------+---+----+--++--++++--+-++-+---+---++-+-+++++\   |  ||| |   || |  |||   ||||  || 
+  ||| |||  ||| |||||| | | ||  | \++++++++-++++--++-+---+-+---++------+---+----+--++--++++--+-++-+---/   || | ||||||   |  ||| |   || |  |||   ||||  || 
+/-+++-+++--+++-++++++-+-+-++--+--++++++++-++++--++-+---+-+---++------+---+----+--++--++++--+-++-+--\    || | ||||||   |  ||| |   || |  |||   ||||  || 
+| ||| |||  v|| \+++++-+-+-++--+--++++++++-++++--++-+---+-+---++------+---+----+--++--+/||  | || |  |    || | ||||||   |  ||| |   || |  |||   ||||  || 
+| ||| |||  |||  ||||| |/+-++--+--++++++++-++++--++-+---+-+---++------+---+----+--++--+-++-\| || | /+----++-+-++++++---+--+++-+--\|| |  |||   ||||  || 
+| ||| |||  |||  ||||| ||| ||  |  \+++++++-++++--++-+---+-+---++------+---+----+--++--+-++-++-++-+-++----++-+-++++++---/  ||| |  ||| |  |||   ||||  || 
+| ||\-+++--+++--+++++-++//++--+---+++++++-++++--++-+---+-+---++--\   |   |  /-+--++--+-++-++-++-+-++--\ || | ||||||      ||| |  ||| |  |||   ||^|  || 
+| ||  |||  \++--+++++-++-+++--+---+++++++-++++--++-+---+-+---++--+---+---+--+-+--++--+-/| || || | ||  | || | ||||||      ||| |  ||| |  |||   ||||  || 
+| ||  |||   ||/-+++++-++-+++--+---+++++++-++++-\|| |   | \---++--+---+---+--+-+--+/  |  | || || | ||  | || | ||||||      ||\-+--+++-+--+/|   ||||  || 
+| ||  \++---+++-+++++-++-+++--+---+++++++-++++-+++-+---+-----++--+---+---+--+-/  |   |  | || || | ||  | || | ||||||      ||/-+--+++-+--+-+---++++-\|| 
+| ||   ||   ||| ||||| || |||  |   ||||||| |||| ||| |   |     ||  |   |/--+--+----+-\ |  | || || | ||  | || | ||||\+------+++-+--+++-+--+-+---++++-+/| 
+| ||   ||   ||| ||||| || |||  |   ||||||| |||| ||| |   |     ||  |   ||  |/-+----+-+-+--+-++-++-+-++--+-++-+-++++-+------+++-+--+++\|  | |   |||| | | 
+| ||   ||   ||| ||||| || ||| /+---+++++++-++++-+++-+---+-----++--+---++--++-+----+-+-+\ | || || | ||  | || | |||| |      ||| |  |||||  | |   |||| | | 
+| ||   ||  /+++-+++++-++-+++-++---+++++++-++++-+++-+---+-----++--+---++--++-+----+-+-++-+-++-++-+\||  | || | |||| | /----+++-+\ |||||  | |   |||| | | 
+| ||   ||/-++++-+++++-++-+++-++-\ ||||||| |||| |||/+---+-----++--+---++--++-+----+-+-++-+-++\\+-++++--+-++-+-++++-+-+----+++-++-+/|||  | |   |||| | | 
+| ||   ||| |||| ||\++-++-+++-+/ | ||||||| |||| |||||   | /---++--+--\||  || |    | | || | ||| | ||||  | || | |||| | |    ||| || | |||  | |   |||| | | 
+| ||   ||| |||| || || || ||| |  | ||||||| |||| |||||   | |   ||  |  |||  || |    | | \+-+-+++-+-/|||  | || | |||| | ^    ||| || | ||\--+-+---++++-+-/ 
+| ||   ||| |||| || || || ||| |  | |||||||/++++-+++++---+-+---++--+--+++--++-+----+-+--+-+-+++-+--+++--+-++-+-++++-+-+----+++-++-+\||   | |   |||| |   
+| ||   ||| |||| || || || ||| |  | |||||||||||| |||||   | |   ||  |  |||  || |    | |  | | ||| |  |||  | || | |||| | |    ||| || ||||   | |   |||| |   
+| ||   ||| |||| || || || ||| | /+-++++++++++++-+++++---+-+---++--+--+++--++-+----+-+--+-+-+++-+--+++--+-++-+-++++-+-+----+++-++-++++--\| |   |||| |   
+| ||   |\+-++++-++-/| || ||| | || |||||||||||| |||||   | |   ||/-+--+++--++-+----+-+--+-+-+++-+--+++--+-++-+-++++-+-+--\ ||| || ||||  || |   |||| |   
+| ||   | | |||| ||  | || ||| | || |||||\++++++-+++++---+-+---+++-+--+++--++-+----+-+--+-/ ||| |  |||  | || | |||| | |  | ||| || ||||  || |   |||| |   
+| ||   | | |||| ||  | || \++-+-++-+++++-++++++-+++++---+-+---+++-/  |||  || |    | |  |   ||| |  |||  | || | |||| | |  | ||| || ||||  || |   |||| |   
+| ||   | | |||| ||  | ||  \+-+-++-+++++-++++++-+++++---+-+---+++----+++--++-+----+-+--+---+++-+--+++--+-++-+-++++-+-+--+-+/| || ||||  || |   |||| |   
+| ||   | | |||\-++--+-++---+-+-++-+++++-++++++-/||||   | |   |||    |||  || |    | |  |   ||| |  |||  | || | |||| | |  | | | || ||||  || |   |||| |   
+| ||   | | ||\--++--+-/|   | | || ||||| ||||||  ||||   | |   |||   /+++--++-+----+-+--+---+++-+--+++--+-++-+-++++-+\|  | | | || ||||  || |   |||| |   
+| || /-+-+-++---++--+--+---+-+-++-+++++-++++++--++++---+-+---+++---++++--++-+----+-+--+---+++-+--+++-\| || | |||\-+++--+-+-+-++-++++--++-+---/||| |   
+| || | | | ||   ||  |  | /-+-+-++-+++++-++++++--++++---+-+---+++---++++--++-+----+-+-\|   ||| |  ||| || || | |v|  |||  | | | || ||||  || |    ||| |   
+| || | | | ||/--++--+--+-+-+-+-++-+++++\||||||  ||||   | |   |||   ||||  || |    | | ||   ||| |  ||| || || | |||  |||  | | | || ||||  || |    ||| |   
+| || |/+-+-+++--++--+--+-+-+-+-++-++++++++++++--++++---+-+\ /+++---++++--++-+----+-+-++---+++-+--+++-++-++-+-+++--+++--+-+-+-++-++++--++-+---\||| |   
+| || ||| | |||  ||  |  | | | \-++-++++++++++++--++++---+-++-++++---++++--++-+----+-+-+/   ||| |  ||| || || | |||  |||  | | | || ||||  || |   |||| |   
+| || ||| | \++--++--+--+-+-+---++-++++++++++++--++++---+-++-++++---++++--++-+----+-+-+----+++-+--/|| || || | |||  |||  | | | || ||||  || |   |||| |   
+| || ||| |  ||  ||  |/-+-+-+---++-++++++++++++--++++---+-++-++++---++++--++-+----+-+-+---\||| |   || || || | |||  |||  | | | || ||||  || |   |||| |   
+| || ||| |  ||  ||  || | | |   || ||||||||||||  ||\+---+-++-++++---++++--++-+----+-+-+---+++/ |   || || || | |||  |||  | | | || ||||  || |   |||| |   
+| || ||| |  ||  ||  || | | |   || |||\++++++++--++-+---+-++-++++---++++--++-+----+-+-+---+++--+---++-++-++-+-+++--/||  | | | || ||||  || |   |||| |   
+| || ||| |  ||  ||  || | | |   || ||| ||||||||  || \---+-++-++++---++++--++-+----/ | |/--+++--+---++-++-++-+-+++---++--+-+-+-++-++++--++\|   |||| |   
+| || ||| \--++--++--++-+-+-+---+/ ||| |||||\++--++-----+-++-++++---++++--++-+------+-++--+++--+---++-++-++-+-+++---++--+-+-+-++-++++--++++---++/| |   
+| || |||    ||  ||  || | | |   |  ||| ||||| ||  ||     | || ||||   ||||  || |  /---+-++--+++--+---++-++-++-+-+++---++-\| | | || ||||  ||||   || | |   
+| || |||    |\--++--++-+-+-+---+--+++-+/||| ||  ||     | || ||||   ||||  || |  |   | ||  |||  |   || || || | |||   || || | | || ||||  ||||   || | |   
+| || |||    |   || /++-+-+-+---+--+++-+-+++-++--++-----+-++-++++---++++\ || |/-+---+-++--+++--+---++-++-++-+-+++---++-++-+-+-++-++++--++++-\ || | |   
+| || |||    |   || ||| | | |   |  ||| |/+++-++--++-----+-++-++++---+++++-++-++-+---+-++--+++--+\  || || || | |||   || || | | || ||||  ||||/+-++-+-+\  
+| || |||    |   || ||| | | |   |  ||| ||||| ||  ||     | || |v|| /-+++++-++-++-+---+-++--+++--++--++-++-++-+-+++---++-++-+-+-++-++++\ |||||| || | ||  
+| || |||    |   || ||| | | |   |  ||| ||||| ||  ||     | || |||| | ||||| || || |  /+-++--+++--++--++-++-++-+-+++---++\|| | | || ||||| |||||| || | ||  
+| || |||    |   || ||| | | |   |  ||| ||||| ||  ||   /-+-++-++++-+-+++++-++-++-+--++-++--+++--++--++-++-++-+-+++---+++++-+-+-++-+++++\|||||| || | ||  
+| || |||    |   || ||| | | |   |  ||| ||||| ||  ||   | | || |||| | ||||| ||/++-+--++-++--+++--++--++-++-++-+-+++---+++++-+-+-++\|||||||||||| || | ||  
+| || |||    |   || ||| | | |   |  ||| ||||| ||  ||   | | || \+++-+-+++++-+++++-+--++-++--+++--++--++-++-++-+-+++---+++++-+-+-+++++++++++++++-/| | ||  
+| \+-+++----+---++-+++-+-+-/   v  ||| ||||| ||  ||   | | ||  ||| | |||\+-+++++-+--+/ ||  |||  ||  || || || | |||   ||||| | | |||||||||||||||  | | ||  
+|  | |||    |/--++-+++-+-+-----+--+++-+++++-++--++---+-+-++--+++-+-+++-+-+++++-+--+--++--+++--++-\|| || || | |||   ||||| | | |||||||||||||||  | | ||  
+|  | |||    ||  || ||| | |     |  ||| ||||| |\--++---+-+-++--+++-+-+++-+-+++++-+--+--++--+++--++-+++-++-++-+-+++---+++++-/ | |||||||||||||||  | | ||  
+|  | |||    || /++-+++-+-+-----+--+++-+++++-+-\ ||   | | ||  ||| | ||| | ||||| |  |  ||  |||  || ||| || || | |||   |||||   | |||||||||||||||  | | ||  
+|  | |||    || ||| ||| | |     |  ||| ||||| | | ||   | | ||  ||| | ||| | ||||| |  |  ||  |||  || ||| || || | |||   |\+++---+-+/|||||||||||||  | | ||  
+|  | |||    || ||| ||| | |     |  ||| ||||| | | ||   | | ||  ||| | ||| | ||||| |  |  ||  |||  || ||| || || | |||   | |||   | | |||||||||||||  | | ||  
+|  | |||    || ||| ||| \-+-----+--+++-+++++-+-+-++---+-+-++--+++-+-+++-+-+++++-+--+--++--+/|  || ||| || || | |||   | |||   | | |||||||||||||  | | ||  
+|  | |||    || ||| |||   |     |  ||| ||||| | | ||   | | \+--+++-+-+/| | ||||| |  |  ||  | |  || ||| || || | |||   | |||   | | |||||||||||||  | | ||  
+|  | |||    \+-+++-+++---+-----+--+++-+++++-+-+-++---+-/  |  ||| | | | | ||||| |  |  ||/-+-+--++-+++-++\|| | |||   | |||   | | |||||||||||||  | | ||  
+|  | |||     | ||| |||   |     |  ||| ||||| | | |\---+----+--+++-+-+-+-+-+++++-+--+--+++-+-+--++-+++-+++++-+-/||   | |||   | | ||||||||\++++--+-/ ||  
+|  | |||     | ||| |||   |     |  ||| ||||| | | |    |    |  ||| | | | | ||||| |  |  ||| | |/-++-+++-+++++-+--++---+-+++--\| | |||||||| ||||  |   ||  
+|  \-+++-----+-+++-+++---+-----+--+++-+++++-+-+-+----+----+--+++-+-+-+-+-+++++-+--+--+++-+-++-++-+++-++++/ |/-++---+-+++--++-+-++++++++-++++--+---++\ 
+|    ^||     | |||/+++---+-----+--+++-+++++-+-+-+----+----+--+++-+-+-+-+-+++++-+-\|  ||| | || || ||| ||||  || ||   | |||  || | |||||||| ||||  |   ||| 
+|    |||     | |||||||   |     |  ||| ||||| | | |    |    |  ||| | | | | ||\++-+-++--+++-+-++-++-+++-++++--++-++---+-+++--++-+-/||||||| ||||  |   ||| 
+|    |||     | |||||||   |     |  ||\-+++++-+-+-+----+----+--+++-+-+-+-+-++-++-+-++--+++-+-++-++-+++-++++--++-+/   | |||  || |  ||||||| ||||  |   ||| 
+|    ||\-----+-+++++++---+-----+--/|  ||||| | | |    |    |  ||| | | | | ||/++-+-++--+++-+-++-++\||| ||||  || |    | |||  || |  ||||||| ||||  |   ||| 
+|    ||      | |||||||   \-----+---+--+++++-+-+-+----+----+--+++-+-+-+-+-+++++-+-++--/|| | || |||||| ||||  || |    | |||  || |  ||||||| ||||  |   ||| 
+|    ||      | ||||||\---------+---+--+++++-+-+-+----+----+--+++-+-+-+-+-+++++-+-++---++-/ || |||||| ||||  || |    | |||  || |  ||||||| ||||  |   ||| 
+|    ||      | |\++++----------+---+--+++++-/ | |    |    |  |\+-+-+-+-+-/|||| | ||   ||   || |||||| ||||  || |    | |||  || |  ||||||| ||||  v   ||| 
+|    ||      | | ||||          |   |  ||\++---+-+----+----+--+-+-+-+-+-+--++++-+-++---++---++-++++++-++++--++-/    | |||  || |  ||||||| ||||  |   ||| 
+|    ||      | | ||||          |   |  || ||   | |    |    |  | \-+-+-+-+--++++-+-++---++---++-++++++-++++--++------+-++/  || |  ||||||| ||||  |   ||| 
+|    ||      | | ||||          \---+--++-++---+-+----+----+--+---+-+-+-+--++++-+-++---++---++-++++++-++++--++------+-++---++-+--++++++/ ||||  |   ||| 
+|    ||      | \-++++--------------+--++-++---/ |    |    |  |   | | | |  |||| | ||   |\---++-++++++-++/|  ||      | ||   || |  ||||||  ||||  |   ||| 
+|    ||      |   ||||              |  || ||     |    |    |  |   | | | |  |||| | ||   |/---++-++++++-++-+--++----\ | ||   || |  ||||||  ||||  |   ||| 
+|    ||      |   ||||              |  || ||   /-+----+----+--+---+-+-+-+--++++-+-++---++---++-++++++-++-+--++----+-+-++--\|| |  ||||||  ||||  |   ||| 
+|    ||      |   ||||              |  || \+---+-+----+----+--+---+-+-+-+--++++-+-++---++---++-++++++-++-+--++----+-+-++--+++-+--+/||||  ||||  |   ||| 
+|    ||      |   |||\--------------+--++--+---+-+----+----+--+---+-+-+-+--++++-+-++---++---++-++++++-++-+--++----+-+-++--+++-/  | ||||  ||||  |   ||| 
+|    ||      |   |||   /-----------+--++--+---+-+----+----+--+---+-+-+-+--++++-+-++--\||   || |||||| || |  ||    | | ||  |||    | ||||  ||||  |   ||| 
+|    ||      |   |||   |           |  \+--+---+-+----+----+--+---+-+-+-+--++++-+-++--+++---++-++++++-++-+--/|    | | ||  |||    | ||||  ||||  |   ||| 
+|    |\------+---+++---+-----------+---+--+---+-+----+----/  |   | | | |  |||| | ||  |||   || |||||| || |   |    | | ||  |||    | ||||  ||||  |   ||| 
+|    |       |   |||   |           |   |  |   | |    |       \---+-+-+-+--++++-+-++--+++---++-++++++-++-/   |    | | ||  |||    | ||||  ||||  |   ||| 
+|    |       |   |||   |           |   |  |/--+-+----+-----------+-+-+-+--++++-+-++--+++---++-++++++-++-----+----+-+-++--+++-\  | ||||  ||||  |   ||| 
+|    |       |   ||\---+-----------+---+--++--+-+----+-----------+-+-+-/  |||| | ||  |||   || |||||| ||     |    | | ||  ||| |  | ||||  ||||  |   ||| 
+|    |       |   ||    |        /--+---+--++\ | |    |           | \-+----++++-+-++--+++---++-++++++-++-----+----+-/ ||  ||| |  | ||||  ||||  |   ||| 
+|    |       |   ||    |        |  |   |  ||| | |    |           |   |    |||| | ||  |||   || |||||| ||     |    |   ||  ||| |  | ||||  ||||  |   ||| 
+|    |       |   ||    |        |  |   |  ||| | |    |           |   |    |||| | ||  |||   |\-++++++-++-----+----+---++--+/| |  | ||||  ||\+--+---+/| 
+|    |       |   ||    \--------+--+---+--+++-+-+----+-----------+---+----++++-+-++--/||   |  \+++++-++-----+----+---++--+-+-+--+-++++--+/ |  |   | | 
+|    |       |   ||             |  |   |  \++-+-+----+-----------+---+----++++-+-++---++---+---+++++-++-----+----+---++--+-+-+--+-/|||  |  |  |   | | 
+|    |     /-+---++--------\    |  |   |   || | |    |           |   |    ||\+-+-++---++---+---+++++-+/     |    |   ||  | | |  |  |||  |  |  |   | | 
+|    |     | |   ||        |    |  |   |   || | |    |           \---+----++-+-+-++---++---+---+++++-+------+----+->-++--+-+-+--+--+/|  |  |  |   | | 
+|    |     | |   ||        |    |  |   |   || | |    |               |    || \-+-++---++---+---+++++-+------+----+---++--+-+-+--+--+-+--+--/  |   | | 
+|    |     | |   \+--------+----+--/   |   \+-+-+----+---------------+----++---+-++---++---+---+++++-+------+----+---++--+-+-/  |  | |  |     |   | | 
+\----+-----+-+----+--------+----+------+----+-+-+----+---------------+----++---+-++---++---+---++++/ |      |    |   ||  | |    |  | |  |     |   | | 
+     |     | |    |        |    |      |    | | |    |       /-------+----++---+-++---++---+---++++--+---\  |    |   ||  | |    |  | |  |     |   | | 
+     |     | |    |        |    |      \----+-+-+----+-------+-------+----++---+-++---++---+---/|||  |   |  |    |   ||  | |    |  | |  |     |   | | 
+     |     | |    |        |    |           | | |    |       |       |    ||   | ||   ||   |    |||  |   |  \----+---++--+-+----+--+-+--+-----+---+-/ 
+     |     | |    |        |    |           | | |    |       |       |    ||   | |\---++---+----+++--+---+-------+---/|  | \----+--+-+--+-----+---/   
+     |     | |    |        |    |           | | |    |       |       \----++---+-+----++---+----+++--+---+-------+----+--+------+--+-+--+-----/       
+     |     | |    |        |    |           | | |    |       |            \+---+-+----++---+----+++--+---+-------+----+--+------+--/ |  |             
+     |     | |    |        |    |           | | \----+-------+-------------+---+-+----++---/    |||  |   |       |    |  |      |    |  |             
+     |     \-+----+--<-----/    |           | |      |       |             |   | |    \+--------+++--+---+-------+----+--+------+----+--/             
+     |       |    \-------------+-----------+-+------+-------+-------------+---+-/     \--------+++--+---+-------/    |  |      |    |                
+     |       |                  \-----------/ |      |       |             |   \----------------+++--+---+------------/  |      |    |                
+     |       |                                |      \-------+-------------+--------------------+++--+---+---------------+------+----/                
+     |       |                                |              |             \--------------------/|\--+---+---------------+------/                     
+     |       v                                \--------------+-----------------------------------+---+---+---------------/                            
+     \-------+-----------------------------------------------+-----------------------------------+---/   |                                            
+             |                                               \-----------------------------------+-------/                                            
+             \--------------------------------------------------------------------------------<--/                                                    
diff --git a/day13.rb b/day13.rb
new file mode 100644
index 0000000..9b2003c
--- /dev/null
+++ b/day13.rb
@@ -0,0 +1,137 @@
+maze = File.readlines("day13")
+
+xmaze = <<'EOF'.lines.to_a
+/->-\        
+|   |  /----\
+| /-+--+-\  |
+| | |  | v  |
+\-+-/  \-+--/
+  \------/   
+EOF
+
+cars = []
+
+maze.each_with_index { |row, i|
+  row.chars.each_with_index { |col, j|
+    case col
+    when "^"; cars << [i,j,:n,:l]; row[j] = "|"
+    when ">"; cars << [i,j,:e,:l]; row[j] = "-"
+    when "v"; cars << [i,j,:s,:l]; row[j] = "|"
+    when "<"; cars << [i,j,:w,:l]; row[j] = "-"
+    end
+  }
+}
+
+
+cars = [
+  [65, 26, :s, :r],
+  [105, 39, :n, :l],
+  [140, 85, :e, :r]
+]
+
+puts maze
+
+crashed = []
+
+loop {
+  cars.sort! #_by! { |(i,j,d,s)| [j,i] }
+
+  p cars.size
+  p cars
+
+  m = maze.map {|l|l.dup}
+  cars.each { |(i,j,d,s)|
+    m[i][j] = case d
+              when :e; ">"
+              when :n; "^"
+              when :s; "v"
+              when :w; "<"
+              end
+  }
+#  puts m
+
+  if cars.size == 1
+    p cars
+    break
+  end
+
+  cars.each_with_index { |(i,j,d,s),n|
+    p [maze[i][j],d]
+    case [maze[i][j],d]
+    when ["-", :e]
+      cars[n][1] += 1
+    when ["-", :w]
+      cars[n][1] -= 1
+    when ["|", :s]
+      cars[n][0] += 1
+    when ["|", :n]
+      cars[n][0] -= 1
+    when ["+", :s]
+      case s
+      when :l; cars[n][1] +=1; cars[n][2] = :e; cars[n][3] = :s
+      when :s; cars[n][0] +=1; cars[n][3] = :r
+      when :r; cars[n][1] -=1; cars[n][2] = :w; cars[n][3] = :l
+      end
+    when ["+", :n]
+      case s
+      when :l; cars[n][1] -=1; cars[n][2] = :w; cars[n][3] = :s
+      when :s; cars[n][0] -=1; cars[n][3] = :r
+      when :r; cars[n][1] +=1; cars[n][2] = :e; cars[n][3] = :l
+      end
+    when ["+", :e]
+      case s
+      when :l; cars[n][0] -=1; cars[n][2] = :n; cars[n][3] = :s
+      when :s; cars[n][1] +=1; cars[n][3] = :r
+      when :r; cars[n][0] +=1; cars[n][2] = :s; cars[n][3] = :l
+      end
+    when ["+", :w]
+      case s
+      when :l; cars[n][0] +=1; cars[n][2] = :s; cars[n][3] = :s
+      when :s; cars[n][1] -=1; cars[n][3] = :r
+      when :r; cars[n][0] -=1; cars[n][2] = :n; cars[n][3] = :l
+      end
+    when ["\\", :e]
+      cars[n][2] = :s
+      cars[n][0] += 1
+    when ["/", :e]
+      cars[n][2] = :n
+      cars[n][0] -= 1
+    when ["\\", :n]
+      cars[n][2] = :w
+      cars[n][1] -= 1
+    when ["/", :n]
+      cars[n][2] = :e
+      cars[n][1] += 1
+    when ["\\", :s]
+      cars[n][2] = :e
+      cars[n][1] += 1
+    when ["/", :s]
+      cars[n][2] = :w
+      cars[n][1] -= 1
+    when ["/", :w]
+      cars[n][2] = :s
+      cars[n][0] += 1
+    when ["\\", :w]
+      cars[n][2] = :n
+      cars[n][0] -= 1
+    else
+      p [:miss, maze[i][j], d]
+    end
+
+    if cars.each.with_index.any? { |(i2,j2,_,_,m)| i == i2 && j == j2 && n != m }
+      if crashed.empty?
+        p [:crash, j, i]
+      end
+      crashed << true
+      cars.delete_at n
+      cars.delete_if { |(i2,j2,_,_,m)| i == i2 && j == j2 }
+    end
+
+  }
+}
+
+p cars
+
+# 32,8 ok
+# 38,38
+
diff --git a/day14 b/day14
new file mode 100644
index 0000000..bb84d0a
--- /dev/null
+++ b/day14
@@ -0,0 +1 @@
+360781
diff --git a/day14.rb b/day14.rb
new file mode 100644
index 0000000..c290b18
--- /dev/null
+++ b/day14.rb
@@ -0,0 +1,25 @@
+d = 360781
+
+s = [3,7]
+e1 = 0
+e2 = 1
+
+30_000_000.times {
+#  p [:X, e1, e2, s[e1], s[e2]]
+  c = (s[e1] + s[e2]).to_s.split('').map(&:to_i)
+  s.concat c
+  e1 = (e1 + 1 + s[e1]) % s.size
+  e2 = (e2 + 1 + s[e2]) % s.size
+
+#  p s
+
+#  p s.size-6  if  s[-7]==3&&s[-6]==6&&s[-5]==0&&s[-4]==7&&s[-3]==9&&s[-2]==1
+#  p s.size-6  if  s[-6]==3&&s[-5]==6&&s[-4]==0&&s[-3]==7&&s[-2]==9&&s[-1]==1
+}
+
+p s.size
+p s[d,10].join('')
+# 6521571010
+
+p s.join('').index d.to_s
+# 20262967
diff --git a/day15.rb b/day15.rb
new file mode 100644
index 0000000..4df8590
--- /dev/null
+++ b/day15.rb
@@ -0,0 +1,32 @@
+################################
+#####################....#######
+#####################....#######
+####################.....#######
+#########...G#######......######
+#########....#....#.........#..#
+######.#...G####.G......#..E...#
+######.##..##.#.......###....###
+####............#.##..###.....##
+####.G.##....G....###.####...###
+####.GGG##........###.#####..###
+#####...##...G.................#
+######.###..G.#####.........####
+######..##...#######........####
+######...GG.#########....E...###
+######.....G#########.E.E......#
+######......#########..........#
+#########.#.#########....#....##
+#########G#.#########.....######
+###.#####G...#######......######
+#..G..##...E..#####........#####
+#..##.##.................E.#####
+#..G.......................#####
+###..G......G..E............####
+###...##.G......#...##......####
+########..E....##.#######..#####
+#######........#################
+#######........#################
+########.##......###############
+######...##..E.E.###############
+######.....##.#.################
+################################
diff --git a/day16 b/day16
new file mode 100644
index 0000000..a768055
--- /dev/null
+++ b/day16
@@ -0,0 +1,4014 @@
+Before: [0, 2, 2, 2]
+4 2 3 2
+After:  [0, 2, 5, 2]
+
+Before: [2, 2, 1, 3]
+3 1 0 2
+After:  [2, 2, 1, 3]
+
+Before: [0, 2, 0, 0]
+8 1 2 0
+After:  [4, 2, 0, 0]
+
+Before: [2, 2, 2, 0]
+2 1 2 2
+After:  [2, 2, 1, 0]
+
+Before: [3, 1, 2, 2]
+11 1 0 3
+After:  [3, 1, 2, 3]
+
+Before: [1, 1, 2, 3]
+12 0 3 0
+After:  [0, 1, 2, 3]
+
+Before: [3, 1, 2, 2]
+15 0 3 3
+After:  [3, 1, 2, 6]
+
+Before: [1, 2, 2, 2]
+6 1 0 1
+After:  [1, 1, 2, 2]
+
+Before: [0, 1, 3, 1]
+5 1 0 2
+After:  [0, 1, 1, 1]
+
+Before: [2, 2, 1, 0]
+3 1 0 1
+After:  [2, 1, 1, 0]
+
+Before: [3, 3, 1, 2]
+6 3 3 1
+After:  [3, 0, 1, 2]
+
+Before: [2, 2, 3, 0]
+3 1 1 0
+After:  [1, 2, 3, 0]
+
+Before: [0, 2, 2, 1]
+15 3 1 0
+After:  [2, 2, 2, 1]
+
+Before: [0, 1, 3, 1]
+5 1 0 0
+After:  [1, 1, 3, 1]
+
+Before: [0, 1, 0, 3]
+5 1 0 0
+After:  [1, 1, 0, 3]
+
+Before: [3, 2, 2, 3]
+7 1 0 3
+After:  [3, 2, 2, 1]
+
+Before: [0, 2, 3, 0]
+10 0 0 1
+After:  [0, 0, 3, 0]
+
+Before: [0, 1, 1, 0]
+4 2 3 0
+After:  [4, 1, 1, 0]
+
+Before: [2, 1, 2, 3]
+14 0 2 1
+After:  [2, 4, 2, 3]
+
+Before: [2, 1, 3, 2]
+1 3 1 2
+After:  [2, 1, 3, 2]
+
+Before: [2, 2, 2, 1]
+1 3 2 0
+After:  [3, 2, 2, 1]
+
+Before: [0, 0, 3, 1]
+10 0 0 0
+After:  [0, 0, 3, 1]
+
+Before: [0, 2, 2, 3]
+2 1 2 3
+After:  [0, 2, 2, 1]
+
+Before: [2, 1, 0, 3]
+12 0 3 2
+After:  [2, 1, 0, 3]
+
+Before: [3, 0, 3, 3]
+4 2 2 1
+After:  [3, 5, 3, 3]
+
+Before: [0, 3, 3, 1]
+3 1 2 0
+After:  [1, 3, 3, 1]
+
+Before: [2, 0, 0, 3]
+12 0 3 1
+After:  [2, 0, 0, 3]
+
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+14 0 1 0
+5 0 3 1
+8 1 0 3
+4 3 1 3
+1 0 0 0
+8 3 2 2
+8 2 2 2
+14 1 2 1
+8 3 0 2
+4 2 0 2
+1 2 0 3
+1 2 2 0
+3 0 3 3
+8 3 2 3
+8 3 1 3
+14 3 1 1
+1 1 1 0
+1 2 1 2
+8 3 0 3
+4 3 3 3
+5 0 2 3
+8 3 3 3
+14 1 3 1
+5 1 1 0
+1 0 3 3
+1 3 1 1
+12 3 2 2
+8 2 1 2
+14 2 0 0
+5 0 3 2
+1 2 1 0
+1 2 2 3
+8 3 0 1
+4 1 1 1
+3 0 3 0
+8 0 2 0
+14 2 0 2
+5 2 3 1
+1 1 2 2
+8 3 0 3
+4 3 3 3
+8 0 0 0
+4 0 1 0
+10 3 2 0
+8 0 1 0
+8 0 3 0
+14 0 1 1
+5 1 0 2
+1 2 1 1
+1 1 1 0
+8 0 0 3
+4 3 2 3
+15 0 3 3
+8 3 3 3
+14 3 2 2
+5 2 0 3
+1 1 1 1
+1 0 1 2
+8 3 0 0
+4 0 3 0
+2 2 0 2
+8 2 2 2
+8 2 3 2
+14 3 2 3
+1 2 2 2
+11 2 0 2
+8 2 2 2
+14 3 2 3
+5 3 1 1
+1 2 3 0
+1 3 0 2
+1 1 2 3
+2 0 2 3
+8 3 2 3
+14 1 3 1
+5 1 1 3
+1 1 1 1
+1 0 2 0
+8 1 2 2
+8 2 1 2
+14 3 2 3
+5 3 1 2
+1 2 2 0
+1 2 2 3
+3 0 3 1
+8 1 2 1
+14 1 2 2
+5 2 1 0
+1 0 2 2
+8 3 0 1
+4 1 1 1
+0 2 3 3
+8 3 1 3
+14 0 3 0
+5 0 1 2
+1 1 1 3
+1 2 3 0
+8 2 0 1
+4 1 3 1
+7 0 1 0
+8 0 1 0
+14 0 2 2
+1 3 2 0
+8 2 0 1
+4 1 2 1
+11 1 0 0
+8 0 3 0
+14 2 0 2
+5 2 2 3
+1 0 0 2
+8 3 0 0
+4 0 3 0
+13 0 1 2
+8 2 2 2
+14 3 2 3
+5 3 2 2
+1 0 1 3
+8 3 0 0
+4 0 1 0
+1 0 3 1
+4 0 1 0
+8 0 3 0
+14 2 0 2
+5 2 1 3
+1 2 0 2
+1 3 0 0
+8 3 0 1
+4 1 2 1
+7 2 0 2
+8 2 3 2
+14 2 3 3
+5 3 0 1
+8 1 0 0
+4 0 1 0
+1 2 2 2
+8 2 0 3
+4 3 0 3
+12 3 2 2
+8 2 2 2
+8 2 3 2
+14 1 2 1
+5 1 0 2
+8 1 0 1
+4 1 3 1
+4 0 1 3
+8 3 2 3
+14 2 3 2
+5 2 2 3
+1 2 2 1
+8 2 0 0
+4 0 0 0
+1 3 0 2
+1 2 0 2
+8 2 2 2
+14 2 3 3
+1 1 2 0
+8 3 0 2
+4 2 2 2
+5 0 2 1
+8 1 1 1
+8 1 2 1
+14 1 3 3
+5 3 1 1
+1 3 3 0
+1 0 0 3
+12 3 2 0
+8 0 1 0
+14 0 1 1
+8 0 0 3
+4 3 2 3
+1 2 1 0
+1 3 0 2
+3 0 3 0
+8 0 3 0
+14 1 0 1
+5 1 1 0
+1 0 1 2
+1 3 0 3
+1 1 3 1
+8 1 2 3
+8 3 2 3
+8 3 1 3
+14 0 3 0
+5 0 2 1
+1 3 3 2
+1 1 2 3
+1 3 3 0
+10 0 2 0
+8 0 2 0
+14 1 0 1
+5 1 3 2
+1 1 0 1
+1 0 0 3
+8 3 0 0
+4 0 0 0
+1 3 1 3
+8 3 1 3
+14 2 3 2
+8 2 0 3
+4 3 0 3
+1 2 0 0
+15 1 0 1
+8 1 2 1
+14 2 1 2
+5 2 3 1
+1 1 1 3
+1 2 0 2
+1 3 1 0
+7 2 0 3
+8 3 2 3
+8 3 3 3
+14 1 3 1
+5 1 3 0
+1 1 0 1
+1 2 2 3
+1 0 1 2
+8 1 2 2
+8 2 2 2
+14 2 0 0
+1 3 3 1
+1 3 0 2
+1 1 2 3
+4 3 1 1
+8 1 3 1
+8 1 1 1
+14 1 0 0
+5 0 0 3
+1 2 0 1
+1 1 0 0
+8 0 2 0
+8 0 1 0
+14 0 3 3
+5 3 2 2
+1 3 0 1
+1 3 0 3
+1 1 1 0
+4 0 1 0
+8 0 1 0
+14 2 0 2
+1 1 0 1
+1 0 0 3
+1 2 2 0
+15 1 0 0
+8 0 2 0
+14 2 0 2
+5 2 1 3
+1 3 0 2
+1 2 2 1
+1 2 1 0
+11 0 2 0
+8 0 1 0
+14 3 0 3
+5 3 1 0
+1 2 1 2
+1 2 2 3
+1 3 2 1
+7 2 1 2
+8 2 3 2
+8 2 1 2
+14 2 0 0
+5 0 3 3
+8 1 0 1
+4 1 0 1
+1 1 1 0
+1 2 1 2
+5 0 2 2
+8 2 2 2
+8 2 1 2
+14 2 3 3
+5 3 1 0
+1 1 2 3
+1 0 1 2
+1 3 0 1
+8 3 2 3
+8 3 3 3
+14 3 0 0
+5 0 2 2
+1 1 3 0
+1 1 0 3
+1 2 2 1
+14 3 0 0
+8 0 3 0
+14 2 0 2
+1 3 3 1
+1 1 2 0
+1 0 0 3
+4 0 1 0
+8 0 3 0
+14 0 2 2
+5 2 0 0
+1 0 1 2
+8 0 0 3
+4 3 1 3
+8 3 2 1
+8 1 1 1
+14 1 0 0
+1 0 0 1
+1 2 0 3
+1 2 0 2
+9 2 3 2
+8 2 3 2
+14 2 0 0
+5 0 0 1
+1 3 0 0
+1 3 0 2
+1 0 3 3
+0 3 2 0
+8 0 2 0
+8 0 2 0
+14 0 1 1
+5 1 3 2
+1 1 0 0
+8 1 0 1
+4 1 1 1
+1 3 3 3
+14 1 0 0
+8 0 3 0
+14 2 0 2
+5 2 0 1
+1 2 1 2
+1 3 0 0
+1 2 1 3
+7 2 0 0
+8 0 2 0
+14 0 1 1
+5 1 0 2
+1 1 0 3
+1 3 3 1
+1 2 1 0
+15 3 0 0
+8 0 3 0
+8 0 3 0
+14 0 2 2
+5 2 1 3
+1 3 2 2
+1 1 3 1
+1 0 0 0
+8 1 2 1
+8 1 2 1
+14 1 3 3
+8 3 0 0
+4 0 2 0
+1 2 1 2
+8 3 0 1
+4 1 3 1
+7 0 1 2
+8 2 3 2
+14 3 2 3
+5 3 2 0
+8 0 0 3
+4 3 0 3
+1 2 0 2
+8 3 0 1
+4 1 1 1
+12 3 2 2
+8 2 2 2
+14 2 0 0
+1 0 1 1
+1 1 0 3
+1 2 0 2
+4 3 1 2
+8 2 1 2
+8 2 2 2
+14 2 0 0
+5 0 0 3
+8 3 0 2
+4 2 3 2
+1 2 1 0
+2 0 2 0
+8 0 3 0
+14 0 3 3
+1 2 2 0
+2 0 2 2
+8 2 2 2
+8 2 1 2
+14 3 2 3
+5 3 0 1
+1 2 0 3
+1 2 2 2
+9 0 3 3
+8 3 1 3
+14 3 1 1
+5 1 3 3
+1 3 3 1
+1 1 3 2
+10 1 2 2
+8 2 2 2
+8 2 1 2
+14 3 2 3
+5 3 0 0
diff --git a/day16.rb b/day16.rb
new file mode 100644
index 0000000..782e9bd
--- /dev/null
+++ b/day16.rb
@@ -0,0 +1,92 @@
+def op(cmd, regs)
+  regs2 = regs.dup
+
+  case cmd[0]
+  when :addr; regs2[cmd[3]] = regs[cmd[1]] + regs[cmd[2]]
+  when :addi; regs2[cmd[3]] = regs[cmd[1]] + cmd[2]
+  when :mulr; regs2[cmd[3]] = regs[cmd[1]] * regs[cmd[2]]
+  when :muli; regs2[cmd[3]] = regs[cmd[1]] * cmd[2]
+  when :banr; regs2[cmd[3]] = regs[cmd[1]] & regs[cmd[2]]
+  when :bani; regs2[cmd[3]] = regs[cmd[1]] & cmd[2]
+  when :borr; regs2[cmd[3]] = regs[cmd[1]] | regs[cmd[2]]
+  when :bori; regs2[cmd[3]] = regs[cmd[1]] | cmd[2]
+  when :setr; regs2[cmd[3]] = regs[cmd[1]]
+  when :seti; regs2[cmd[3]] = cmd[1]
+  when :gtir; regs2[cmd[3]] = cmd[1] > regs[cmd[2]] ? 1 : 0
+  when :gtri; regs2[cmd[3]] = regs[cmd[1]] > cmd[2] ? 1 : 0
+  when :gtrr; regs2[cmd[3]] = regs[cmd[1]] > regs[cmd[2]] ? 1 : 0
+  when :eqri; regs2[cmd[3]] = regs[cmd[1]] == cmd[2] ? 1 : 0
+  when :eqir; regs2[cmd[3]] = cmd[1] == regs[cmd[2]] ? 1 : 0
+  when :eqrr; regs2[cmd[3]] = regs[cmd[1]] == regs[cmd[2]] ? 1 : 0
+  end
+
+  regs2
+end
+
+OPS = [:addr, :addi, :mulr, :muli, :banr, :bani, :borr, :bori, :setr, :seti,
+ :gtri, :gtir, :gtrr, :eqri, :eqir, :eqrr]
+
+OPS.each { |o|
+  
+  if op([o, 2, 1, 2], [3, 2, 1, 1]) == [3, 2, 2, 1]
+    p o
+  end
+}
+
+p1 = 0
+
+poss = Array.new(16) { OPS }
+
+code = nil
+
+File.read("day16").split("\n\n").each { |samp|
+  if samp =~ /^Before:/
+    x = samp.lines.map { |l| l.scan(/\[.*?\]/) }
+    before = eval(x[0].first)
+    unop, *args = samp.lines[1].split(' ').map(&:to_i)
+    after = eval(x[2].first)
+
+    n = OPS.find_all { |o|
+      op([o, *args], before) == after
+    }
+    
+    poss[unop] &= n
+
+    if n.size >= 3
+      p1 += 1
+    end
+  else
+    code = samp
+  end
+}
+
+p p1
+
+require 'pp'
+
+pp poss
+
+loop {
+  det = poss.find_all { |p| p.size == 1 }.flatten
+  break  if det.size == 16
+  poss.each_index { |i|
+    poss[i] -= det  unless poss[i].size == 1
+  }
+}
+
+poss.map!(&:first)
+
+p poss
+
+regs = [0,0,0,0]
+code.each_line { |l|
+  numop, *args = l.split(' ').map(&:to_i)
+  regs = op([poss[numop], *args], regs)
+}
+p regs[0]
+
+__END__
+
+Before: [3, 2, 1, 1]
+9 2 1 2
+After:  [3, 2, 2, 1]
diff --git a/day18 b/day18
new file mode 100644
index 0000000..3fc46f8
--- /dev/null
+++ b/day18
@@ -0,0 +1,50 @@
+....||.#|..|...|.#..#...|.|.....|.....##|.....||..
+....#.|..|.....#|....|#|##|...#........|...#.#|.#.
+.#||....|...#####..|.|.#..|..|.|..#.|#....#..||#..
+.....|....|..|....#....#..#...||....|.....#.|#..|#
+.|.#||##.|..#....|#.|..|||#..##.|.#.|..##..|...|.|
+.|.|...|...|#.|.....#...#|.#.....#..|#........###.
+......|#|..#....|.#.#|....||#|.|#.....#|..#.#||...
+.|.......##|..|..#|....|.|.|....#..|#|#.#...#.||##
+##|..#.#..#||.###.|......|#.|....#...#.|...#....#|
+..|###|#....#.|.#|#|.....|..|.||#|.|#.||...|##...#
+...#....|.||||.|.|.##...#..|.||.|....#|#|#.|..|||.
+|#....#...##..#||..|..#|.......|#|....|.|.|..|##..
+|#....|.|..|..|..#.#......|..|.|..|||.#||...#.#.||
+...|.|.....#.##|....|..#.|.....||..##..#..|||.....
+.###.#.|.|||#.#.|.|.|...#..###..#|.........|.....#
+|..#..|#..#........#.#.###.#...|.|.....|.||.|.|.||
+|##.|..#..#...#|.........#|...#||.|..#|#.|.|..||..
+....||.|....#.....|......#.|.|#.#.......|.|...#...
+|.#.#|..#|#..#.#......#||.#..|||.#.#..#.||.####.#.
+|.||.|.|.|#|.#.#|.#.|||..|........|..#..|.......|.
+##..|.#..||............|||..#....|.....###|#...|#.
+#|.|..#.|.|......|#|#.||.|....#...#....|...|...|..
+#.#.#...##...#....|#|#||.#|#...|#||#|....|..|...||
+.|.#.|.|...###.|..##..||#..|.....||.|.|....##..#|#
+..#|#|..##...##|..|||||.|....|.#..|...|...#.#|||..
+..|.|....#.##.##|..|#..|...||...|..||##..##...#.##
+..#|###..##....##|.||.|.|.||#...|.#.#|#.##||.|..|.
+...|#...|#..#.....#|.....##..##.......#...##.|...#
+.|..#.##|....#.#.#...|...##........|##|..#.|...|..
+......|#....#.........#.|.....||...#|.|...#.|#....
+..|.#..###||...#|###...|.|...|.|....#...#..|.|.#.|
+.#|....||#.#|..#.#|..##.........|#.|.....#....|||.
+....#.#....#|.|#.#.#.|#............|.#.#....|#...|
+..|#....#|...#.#..#.#.#||..#.#..|......##.#.||....
+..|#....|#..|.#..#....#.|#.||.....#..#.#|.#...|..#
+.#........|||.......|....|||.#|#..#.#|#........||.
+#..|.....#...#..#.|#....##...##.##...#||.........|
+..|.##.|..|...|..#|#.|.........||...##......###.|.
+.|..|...#....||..#....#||#...#.#......##......#|.#
+.|..#......#.|.#.##.|..|...#.|##..|||...|.......#.
+...#..#..|#.|.....#||.|....#...|##|##.....|.#..|..
+#.....#...#...##.|....|......##...|...#.#.#.|.....
+....#..|.|.|###|.##.|.#|.|.||.|#..|#..#...|.##.#..
+..|.|.#.|#.#...##.#||#...#..||.#.|#..|###....|#...
+|.|..........|.#......#..#|.#...#.....#.#.#|.###.|
+#..#|||....#..|....##|...|.#.|##||.|..|.#|.|...|#|
+.|###..#.....|.#.||.#..|#...#.#|.#|.|.##|....#|#..
+.|...#...##......|..#.|#|.#.##......#.|......|...|
+#.#..|#.#...#.|#|....#|##..#....##|..#.|..|#...|..
+.#.#..|.#..#........##.|#..|##||......|..#...#....
diff --git a/day18.rb b/day18.rb
new file mode 100644
index 0000000..a9f0967
--- /dev/null
+++ b/day18.rb
@@ -0,0 +1,95 @@
+d = ["\n", *File.readlines("day18").map { |x| " " + x }, "\n"]
+
+
+=begin
+    An open acre will become filled with trees if three or more adjacent acres contained trees. Otherwise, nothing happens.
+    An acre filled with trees will become a lumberyard if three or more adjacent acres were lumberyards. Otherwise, nothing happens.
+    An acre containing a lumberyard will remain a lumberyard if it was adjacent to at least one other lumberyard and at least one acre containing trees. Otherwise, it becomes open.
+=end
+
+
+xd = <<EOF.lines.to_a
+
+ .#.#...|#.
+ .....#|##|
+ .|..|...#.
+ ..|#.....#
+ #.#|||#|#|
+ ...#.||...
+ .|....|...
+ ||...#|.#|
+ |.||||..|.
+ ...#.|..|.
+
+EOF
+
+require 'pp'
+
+seen = []
+
+p1 = 0
+
+i = 0
+d2 = nil
+1000.times { |i|
+pp d
+
+d2 = d.map(&:clone)
+
+d.each_index { |i|
+  d[i].chars.each_index { |j|
+    case d[i][j]
+    when '.'
+      if [d[i-1][j-1], d[i-1][j], d[i-1][j+1],
+          d[i  ][j-1],            d[i  ][j+1],
+          d[i+1][j-1], d[i+1][j], d[i+1][j+1]].count('|') >= 3
+        d2[i][j] = '|'
+      end
+    when '|'
+      if [d[i-1][j-1], d[i-1][j], d[i-1][j+1],
+          d[i  ][j-1],            d[i  ][j+1],
+          d[i+1][j-1], d[i+1][j], d[i+1][j+1]].count('#') >= 3
+        d2[i][j] = '#'
+      end
+    when '#'
+      s = [d[i-1][j-1], d[i-1][j], d[i-1][j+1], :X,
+           d[i  ][j-1],            d[i  ][j+1], :Y,
+           d[i+1][j-1], d[i+1][j], d[i+1][j+1]]
+      if s.include?('#') && s.include?('|')
+        # keep
+      else
+        d2[i][j] = '.'
+      end
+    end
+  }
+}
+
+if seen.include? d2
+  p [:cycle, i, seen.size - seen.index(d2)]
+  break
+else
+  seen << d2
+end
+
+if i == 10
+  r = d.join
+  p1 = r.count('#') * r.count('|')   # 535522
+end
+
+d = d2
+r = d.join
+}
+
+
+p p1
+
+n = (1000000000-i)%(seen.size - seen.index(d2))
+
+p seen.map { |s|
+r = s.join
+p2 = r.count('#') * r.count('|')
+}.index(210160)
+
+#p p2
+
+# 210160
diff --git a/day19 b/day19
new file mode 100644
index 0000000..3a7db07
--- /dev/null
+++ b/day19
@@ -0,0 +1,37 @@
+#ip 4
+addi 4 16 4
+seti 1 9 5
+seti 1 5 2
+mulr 5 2 1
+eqrr 1 3 1
+addr 1 4 4
+addi 4 1 4
+addr 5 0 0
+addi 2 1 2
+gtrr 2 3 1
+addr 4 1 4
+seti 2 6 4
+addi 5 1 5
+gtrr 5 3 1
+addr 1 4 4
+seti 1 2 4
+mulr 4 4 4
+addi 3 2 3
+mulr 3 3 3
+mulr 4 3 3
+muli 3 11 3
+addi 1 5 1
+mulr 1 4 1
+addi 1 2 1
+addr 3 1 3
+addr 4 0 4
+seti 0 2 4
+setr 4 8 1
+mulr 1 4 1
+addr 4 1 1
+mulr 4 1 1
+muli 1 14 1
+mulr 1 4 1
+addr 3 1 3
+seti 0 0 0
+seti 0 2 4
diff --git a/day19.rb b/day19.rb
new file mode 100644
index 0000000..ec3e2ff
--- /dev/null
+++ b/day19.rb
@@ -0,0 +1,86 @@
+insn = [:eqri, :seti, :eqir, :eqrr, :addi, :setr, :gtrr, :gtir, :muli, :bori, :bani, :borr, :gtri, :banr, :addr, :mulr]
+
+def op(cmd, regs)
+  regs2 = regs.dup
+
+  case cmd[0]
+  when :addr; regs2[cmd[3]] = regs[cmd[1]] + regs[cmd[2]]
+  when :addi; regs2[cmd[3]] = regs[cmd[1]] + cmd[2]
+  when :mulr; regs2[cmd[3]] = regs[cmd[1]] * regs[cmd[2]]
+  when :muli; regs2[cmd[3]] = regs[cmd[1]] * cmd[2]
+  when :banr; regs2[cmd[3]] = regs[cmd[1]] & regs[cmd[2]]
+  when :bani; regs2[cmd[3]] = regs[cmd[1]] & cmd[2]
+  when :borr; regs2[cmd[3]] = regs[cmd[1]] | regs[cmd[2]]
+  when :bori; regs2[cmd[3]] = regs[cmd[1]] | cmd[2]
+  when :setr; regs2[cmd[3]] = regs[cmd[1]]
+  when :seti; regs2[cmd[3]] = cmd[1]
+  when :gtir; regs2[cmd[3]] = cmd[1] > regs[cmd[2]] ? 1 : 0
+  when :gtri; regs2[cmd[3]] = regs[cmd[1]] > cmd[2] ? 1 : 0
+  when :gtrr; regs2[cmd[3]] = regs[cmd[1]] > regs[cmd[2]] ? 1 : 0
+  when :eqri; regs2[cmd[3]] = regs[cmd[1]] == cmd[2] ? 1 : 0
+  when :eqir; regs2[cmd[3]] = cmd[1] == regs[cmd[2]] ? 1 : 0
+  when :eqrr; regs2[cmd[3]] = regs[cmd[1]] == regs[cmd[2]] ? 1 : 0
+  end
+
+  regs2
+end
+
+
+r0 = 0
+r3=10551348
+
+f = [1,
+ 2,
+ 3,
+ 4,
+ 6,
+ 9,
+ 12,
+ 18,
+ 36,
+ 293093,
+ 586186,
+ 879279,
+ 1172372,
+ 1758558,
+ 2637837,
+ 3517116,
+ 5275674,
+ 10551348]
+
+f.each { |r1|
+  f.each { |r5|
+    if r1*r5 == r3
+      r0 += r1
+    end
+  }
+}
+
+p r0
+
+
+rip, *program = File.readlines("day19")
+
+rip = rip.scan(/\d/)[0].to_i
+
+program.map! { |line|
+  o,a,b,c = line.split
+  [o.to_sym, a.to_i, b.to_i, c.to_i]
+}
+
+regs = [0]*6
+regs[0] = 1
+ip = 0
+
+loop {
+  break  if ip < 0 || ip > program.size
+
+  regs[rip] = ip
+  p regs
+  regs = op(program[ip], regs)
+  ip = regs[rip] + 1
+}
+
+p regs.first  # 2240
+
+# 10844452 too low
diff --git a/day20 b/day20
new file mode 100644
index 0000000..10e6b40
--- /dev/null
+++ b/day20
@@ -0,0 +1 @@
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(EEESESEEEEESWWSWSWNWN(EE|WWSESESWWWWSESESEENN(W(S|W)|EESEESESEEESWSEESEEEEEEE(SWSESWWNNWSSSWWWNNEN(ESSWENNW|)WWSSW(WNENWN(E|W(S|WWNN(ESENSWNW|)W(S|WNW(N(EESEWNWW|)N|WS(WNWSWNNWWWWWSWS(WWWNENWWSWNWNENNNENWWN(EN(ESESENE(NWWEES|)SEEESSSS(EE(E|NWNNE(ENN(E(SSEWNN|)NN(WS|ESE)|WSWNWWW(EEESENSWNWWW|))|S))|WWW(WWNN(WSSNNE|)EN(EESWS(EENNSSWW|)W|W)|S(S|E)))|W)|WWSESWSSSWNNNWW(WW|NEENNWSWN(SENESSNNWSWN|)|SESSSEESE(NNNEN(N|W)|ESWSS(WNNW(SSWWWW|N)|ES(SEESENE(S|NNWSWWNEN(NWSWENES|)EE)|W)))))|EESENN(EE|W))|E|S)))))|SSSSEEENEN(WWW(SEWN|)N|EESESWW(WSEESWWSSSSSW(SWSWSESWSSSS(WNWNWNEE(NWWNWWSSWNNNWSWNNNW(NENWESWS|)SSSS(SENESSESENE(SS(E(N|E)|WWWWN(NWSWWSEE(WWNEENSWWSEE|)|E))|NN)|WNNWNE)|S)|EEENEENWWWN(WSSEWNNE|)ENEES(ESE(SSW(N|WW)|NNNW(WNEENWWW(SW(N|WS(EE|S))|NENEE(SWEN|)NNWN(ENWNENNNNW(W|S)|WWSES(WSNE|)E))|S))|W))|NNNNNWWW(WNEEEE|SS(EENWESWW|)S))|N)))|NNNWNENNNWWNNESENNNNNNWSSWNNWWSWSSSSWWSSWWNNW(SSWNW(NEWS|)SS(EES(W|ENESS(WW|ESSEENNEEE(SSESWWNNWSSWW(EENNESNWSSWW|)|NWWNWW(NEEE(SEESNWWN|)NNNW(SSWWEENN|)NNE(SESENSWNWN|)N|WSE(SS|E)))))|WN(N|WW))|NNENEESS(ENNNWWWWNWWNENNNNEESWSSSEES(EENWNNENWNW(SSWSEWNENN|)NWNNWNWW(SSE(N|ESWWSW(SW(SSE(SSWSW(WN(EN(E|NN)|W)|SEENEES(E|W))|EN(W|N))|N)|N))|NEEEENWW(W|NNESENNWN(EESEESSSSWNNW(NEWS|)SSSESWS(WNNWESSE|)SEES(W|SSS(W|S(S|EEEENNE(NNNWSSWSWS(E|WNNENNNE(EENWWWWW(NEENNNW(NNESEENE(SSSSWW(SEE|NENW)|NWW(WNENEE(SWEN|)NWNWNWNNNWNWNWSWNNNNWW(SSE(N|S(W|SSES(W|ESWSSSESEE(SSWWNE|EN(NWW(SEWN|)WNENE(NWNWESES|)S|E)))))|NEEESENESSEEESE(SSSWNNWW(N(E|W(WNWSNESE|)S)|SESSSENESS(W|S))|NNNWWW(SEEWWN|)NENNESSENNNWWWN(ENEE(SWEN|)N|WWSSWNNNNE(S|NNWWNNNWW(NN(EESWENWW|)N(WSNE|)N|SSSWWSESSWSSESWS(ES(WSS(ENSW|)WWWWW|EENWNEE(SSENEE(SWEN|)N(ESNW|)N|NNWW(SEWN|)(W|NNEN(NNN|W|E(SSWENN|)E))))|WNWWNEENNN(E|NWWNEN(E(N|EE|S)|WWS(WNSE|)SSSSENNESS(NNWSSWENNESS|)))))))))|S))|SS)|S(ESSNNW|)W)|SS))|SS))))|W(NWWS(E|W)|S))))|W)|W(SS|N|W))))))|N)))|N))|N)|NEN(NNE(S|ENWN(E|NWSW(SEWN|)(W|NNN)))|WWSWS(E|W)))|NNN(ESSNNW|)W))|W)))|EEE))|W))|N)|WN(E|W(NENSWS|)W)))|E)))|N)|NNNNWNWWS(E|WNN(EEEE(S|N)|NWNENWW(SWSES(W|SE(S|N))|N))))))))|W))|S(E|S))|WW)|S)|S)|N)|WW))|NNNW(WNEWSE|)S)|W)|WWWW(S|NNWNE(ESS|NWWW)))|NEEN(WW|E(E|N)))))|WSW(N|SWSEE(N|SW(SEEE(NWNSES|)EESS(E|SSSS(EEEE(N(E(N|ES(ENSW|)W)|W)|SS)|WWWN(WWSESEEESWWWSSWNW(SWSEEEEEEN(NWWSEWNEES|)ESSE(SWW(S|WN(W|E))|EN(WN|EESW))|NN(ESNW|)W)|EE)))|W)))))|WW))))))|W(S|NNEEN(EE|WNWSWWS(WW|E))))|WSWWSWNW(N|SWSSWSSWSWSSS(WWNWSW(SSS(WNSE|)EENENWWS(NEESWSNENWWS|)|NNENW(WSWWEENE|)NEN(EES(ENENWESWSW|)SW(SESNWN|)N|NNNWWWNWNENENN(EENEN(ESESE(SWW(WNE|SEE)|NNNW(NW(NEEE(SWEN|)NNE(SEWN|)NNNW(NEWS|)WWWSSESWSEENNENWW(EESWSSNNENWW|)|S)|S))|W)|WSWWS(WNW(SSEESWSW(N|SEEE(NWES|)EEES(W|S))|NEENES)|E))))|ENNE(S|E(E|N(W|NN))))))|W)|ENNESSS(SSEEE(SWWEEN|)(NN|EE)|WW)))|W)|N)|W))))|E(NEEENW(WWW|NEN(W|E(N|SSS(SWWWEEEN|)EENNWS)))|SS))|E)|N)))|SEEESE(NNWNSESS|)SWS(EE(SWSEENE(WSWWNEWSEENE|)|NN)|W))|W)|WWS(S|E))))))|NE(N|S)))|WNNNEN(E|WW))))|W))|N)|NWNNES)|W))|W)))|NNNNESSSENNN(SSSWNNSSENNN|))|NN(E(S|EN(W|ESEENNW(S|NNNNWWW(SEESNWWN|)NEEEENE(N|SESS(ENNESNWSSW|)SSWNW(NNESNWSS|)S))))|W))))|S)))|W)|W(NN|W))|E)|W(NEWS|)S))|SEESWSSSSWWSS(E(NEENSWWS|)SS|WNWW(SEWN|)NEEN(EENNNSSSWW|)W))))|N))|NN)|NENEN(WNNSSE|)EEE(N(W|EN(WNE|ES))|S(S|WW))))|NN))))|N)|N)|NNNENWNENNESSSSENEENEE(NWWNWSW(SEWN|)NNWWNNENESEEEEN(NWWW(SEEWWN|)NEEENWN(WWWWWSSW(NNNNN(E(EENNEWSSWW|)SS|NNNNNE)|SE(EENN(WSNE|)EE|SWSSSSS(NNNNNEWSSSSS|)))|EEE)|ESE(SWWSEESSWNWWNNWW(SEWN|)WW|N))|SSW(N|WWS(WWWSNEEE|)E)))|ESENNEEESSWW(NEWS|)SS(WNWESE|)(SS|EEN(W|E(S|ENWNEESE(NNNESSS(NNNWSSNNESSS|)|S(S|W)))))))|N)|NNESEE(NWN(WNENNENWWW(SESWSS|NNEEES(EENEENWNEESSEENNNW(NEEESSW(SSSWWWS(WW(NEWS|)WW|EESENENNEN(W|NNEEENEENN(WWS(WWN(WWWWWS(EEEESEE(WWNWWWEEESEE|)|WSWS(WNNWN(WSWNWWSSW(NN|SEEN(N|EESSS(ENNNSSSW|)(S|WN(N|WSWNWS))))|EE(S|E))|E))|E)|E)|EEESSWW(NEWS|)SESWSSENENESSWSES(WWWN(E|WNNNNWSSSWSW(SES(W|EE(NWNSES|)ESS(WNSE|)E(NN|S))|W(NNE(S|N(ESNW|)W)|W)))|E(NNNE(SSENEWSWNN|)NNW(W(NNNEEWWSSS|)W|S)|S)))))|N)|SS)|WW))|E)|S(S|W))))))|E))))|ESS(EN(ESNW|)N|W(WW|N))))))|NN(ENWESW|)WSWSWNN(N|E)))|S))))|E)|N)))|SWWSEESSWWWN(NNWSSSSE(E|SSW(SSS|N))|EE))|EE))|EE))|E(NN|E))|SS))|SEESS(S|EEE(NWWNEWSEES|)E))))|WS(WW|E(SWSEWNEN|)E))|E))))))|WNWWS(ESNW|)WNWWWW(SEEESNWWWN|)NEENN(WWS(E|W(NNNESEN(SWNWSSNNESEN|)|W))|ESSEEEE(WWWWNNSSEEEE|)))|SWWSSE(SSEWNN|)N))|N))|W)|SS(WNSE|)S))))))|NNNE(N(ESNW|)W|S))|E))))|S(E|SSW(WNENSWSE|)SEESWS(W(WWSSNNEE|)N|E))))|S))))$
diff --git a/day20.rb b/day20.rb
new file mode 100644
index 0000000..1b4fc78
--- /dev/null
+++ b/day20.rb
@@ -0,0 +1,48 @@
+r = File.read("day20")
+
+#r = "^ENNWSWW(NEWS|)SSSEEN(WNSE|)EE(SWEN|)NNN$"
+#r = "^WSSEESWWWNW(S|NENNEEEENN(ESSSSW(NWSW|SSEN)|WSWWN(E|WWS(E|SS))))$"
+
+r.gsub!(/^\^|\$$/, '')
+
+
+def dist(str)
+  seen = []
+  x = y = 0
+  str.chars.each { |c|
+    case c
+    when "E"; x += 1
+    when "W"; x -= 1
+    when "S"; y += 1
+    when "N"; y -= 1
+    end
+    seen << [x,y]
+  }
+  seen.uniq.size
+end
+
+p1 = 0
+p2 = 0
+
+stk = [""]
+r.chars.each { |c|
+  case c
+  when "E", "S", "W", "N"
+    stk.last << c
+    p1 = [p1, dist(stk.last)].max
+    p2 += 1  if dist(stk.last) > 1000
+  when "("
+    stk << stk.last.dup
+  when "|"
+    stk.pop
+    stk << stk.last.dup
+  when ")"
+    stk.pop
+  end
+}
+
+p p1  # 3788
+p p2  # 8568
+
+# 9558 too high
+# 9557 too high
diff --git a/day21 b/day21
new file mode 100644
index 0000000..f2d4b98
--- /dev/null
+++ b/day21
@@ -0,0 +1,32 @@
+#ip 1
+seti 123 0 5
+bani 5 456 5
+eqri 5 72 5
+addr 5 1 1
+seti 0 0 1
+seti 0 3 5
+bori 5 65536 4
+seti 13284195 4 5
+bani 4 255 3
+addr 5 3 5
+bani 5 16777215 5
+muli 5 65899 5
+bani 5 16777215 5
+gtir 256 4 3
+addr 3 1 1
+addi 1 1 1
+seti 27 1 1
+seti 0 5 3
+addi 3 1 2
+muli 2 256 2
+gtrr 2 4 2
+addr 2 1 1
+addi 1 1 1
+seti 25 2 1
+addi 3 1 3
+seti 17 1 1
+setr 3 7 4
+seti 7 3 1
+eqrr 5 0 3
+addr 3 1 1
+seti 5 3 1
diff --git a/day21.rb b/day21.rb
new file mode 100644
index 0000000..a64a16a
--- /dev/null
+++ b/day21.rb
@@ -0,0 +1,67 @@
+insn = [:eqri, :seti, :eqir, :eqrr, :addi, :setr, :gtrr, :gtir, :muli, :bori, :bani, :borr, :gtri, :banr, :addr, :mulr]
+
+def op(cmd, regs)
+  regs2 = regs.dup
+
+  case cmd[0]
+  when :addr; regs2[cmd[3]] = regs[cmd[1]] + regs[cmd[2]]
+  when :addi; regs2[cmd[3]] = regs[cmd[1]] + cmd[2]
+  when :mulr; regs2[cmd[3]] = regs[cmd[1]] * regs[cmd[2]]
+  when :muli; regs2[cmd[3]] = regs[cmd[1]] * cmd[2]
+  when :banr; regs2[cmd[3]] = regs[cmd[1]] & regs[cmd[2]]
+  when :bani; regs2[cmd[3]] = regs[cmd[1]] & cmd[2]
+  when :borr; regs2[cmd[3]] = regs[cmd[1]] | regs[cmd[2]]
+  when :bori; regs2[cmd[3]] = regs[cmd[1]] | cmd[2]
+  when :setr; regs2[cmd[3]] = regs[cmd[1]]
+  when :seti; regs2[cmd[3]] = cmd[1]
+  when :gtir; regs2[cmd[3]] = cmd[1] > regs[cmd[2]] ? 1 : 0
+  when :gtri; regs2[cmd[3]] = regs[cmd[1]] > cmd[2] ? 1 : 0
+  when :gtrr; regs2[cmd[3]] = regs[cmd[1]] > regs[cmd[2]] ? 1 : 0
+  when :eqri; regs2[cmd[3]] = regs[cmd[1]] == cmd[2] ? 1 : 0
+  when :eqir; regs2[cmd[3]] = cmd[1] == regs[cmd[2]] ? 1 : 0
+  when :eqrr; regs2[cmd[3]] = regs[cmd[1]] == regs[cmd[2]] ? 1 : 0
+  end
+
+  regs2
+end
+
+rip, *program = File.readlines("day21")
+
+rip = rip.scan(/\d/)[0].to_i
+
+program.map! { |line|
+  o,a,b,c = line.split
+  [o.to_sym, a.to_i, b.to_i, c.to_i]
+}
+
+regs = [0]*6
+regs[0] = 0
+ip = 0
+
+or5 = 0
+
+seen = []
+
+# 3_000_000.times {
+loop {
+  break  if ip < 0 || ip >= program.size
+
+  regs[rip] = ip
+  regs = op(program[ip], regs)
+
+  if program[ip][0] == :eqrr
+    p regs[5]
+    if seen.include? regs[5]
+      break
+    end
+    seen << regs[5]
+  end
+
+  ip = regs[rip] + 1
+}
+
+p regs
+p seen
+
+# 7224964
+# 13813247 first before duplicate
diff --git a/day22 b/day22
new file mode 100644
index 0000000..0426b39
--- /dev/null
+++ b/day22
@@ -0,0 +1,2 @@
+depth: 11739
+target: 11,718
diff --git a/day22.rb b/day22.rb
new file mode 100644
index 0000000..e1cb1a8
--- /dev/null
+++ b/day22.rb
@@ -0,0 +1,34 @@
+DEPTH = 11739
+TX, TY = 11, 718
+
+#DEPTH = 510
+#TX, TY = 10, 10
+
+$GI = {}
+def gi(x,y)
+  $GI[[x,y]] ||=
+  if (x == 0 && y == 0) || (x == TX && y == TY)
+    0
+  elsif y == 0
+    x * 16807
+  elsif x == 0
+    y * 48271
+  else
+    el(x-1,y) * el(x,y-1)
+  end
+end
+
+def el(x,y)
+  (gi(x,y) + DEPTH) % 20183
+end
+
+p gi(0,0)
+p el(1,1)
+
+p1 = 0
+(0..TX).each { |x|
+  (0..TY).each { |y|
+    p1 += el(x,y)%3
+  }
+}
+p p1  # 8735
diff --git a/day23 b/day23
new file mode 100644
index 0000000..47b4554
--- /dev/null
+++ b/day23
@@ -0,0 +1,1000 @@
+pos=<-22356506,24819383,19709017>, r=53389427
+pos=<-17754746,29336035,-6021399>, r=68469044
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+pos=<-36162654,8056165,9432272>, r=70104221
+pos=<11436037,29048070,32190088>, r=73021637
+pos=<6483456,22081501,23232660>, r=64032836
+pos=<45571672,39708352,55410440>, r=89261119
+pos=<-3973530,28214854,57251942>, r=75944882
diff --git a/day23.rb b/day23.rb
new file mode 100644
index 0000000..d946376
--- /dev/null
+++ b/day23.rb
@@ -0,0 +1,21 @@
+file = File.read("day23")
+
+bots = file.lines.map { |l|
+  l.scan(/<(-?\d+),(-?\d+),(-?\d+)>.*r=(-?\d+)/).first.map(&:to_i)
+}
+
+strongest = bots.max_by { |x,y,z,w| w }
+
+p bots.count { |x,y,z,w|
+  ((x-strongest[0]).abs +
+   (y-strongest[1]).abs +
+   (z-strongest[2]).abs) <= strongest[3]
+}  # 577
+
+
+p bots.map { |b| b[0] }.sum 
+p bots.map { |b| b[1] }.sum
+p bots.map { |b| b[2] }.sum
+
+#  16933511,19092135,15403726
+# 51429372
diff --git a/day24 b/day24
new file mode 100644
index 0000000..b5339c9
--- /dev/null
+++ b/day24
@@ -0,0 +1,23 @@
+Immune System:
+1466 units each with 7549 hit points (weak to fire, bludgeoning) with an attack that does 49 fire damage at initiative 1
+8647 units each with 6003 hit points (weak to radiation, cold) with an attack that does 6 cold damage at initiative 3
+2777 units each with 7460 hit points (weak to fire; immune to slashing) with an attack that does 24 bludgeoning damage at initiative 7
+470 units each with 1938 hit points (weak to fire, cold) with an attack that does 40 cold damage at initiative 18
+4203 units each with 6288 hit points (immune to fire) with an attack that does 13 cold damage at initiative 9
+2975 units each with 4211 hit points (immune to slashing) with an attack that does 14 slashing damage at initiative 20
+123 units each with 10083 hit points (immune to radiation; weak to fire) with an attack that does 777 bludgeoning damage at initiative 15
+3455 units each with 6391 hit points (weak to radiation, slashing; immune to cold, bludgeoning) with an attack that does 16 bludgeoning damage at initiative 19
+4323 units each with 4880 hit points (weak to cold; immune to radiation) with an attack that does 10 slashing damage at initiative 14
+1586 units each with 3567 hit points (weak to bludgeoning, radiation; immune to slashing, cold) with an attack that does 17 radiation damage at initiative 4
+
+Infection:
+5380 units each with 18316 hit points with an attack that does 5 slashing damage at initiative 17
+6230 units each with 12274 hit points (weak to slashing) with an attack that does 3 fire damage at initiative 16
+214 units each with 27761 hit points (weak to bludgeoning) with an attack that does 233 fire damage at initiative 11
+1515 units each with 47688 hit points (weak to slashing; immune to radiation) with an attack that does 49 cold damage at initiative 8
+268 units each with 44231 hit points with an attack that does 259 fire damage at initiative 6
+2318 units each with 22996 hit points with an attack that does 18 fire damage at initiative 5
+9492 units each with 19449 hit points (weak to bludgeoning, slashing; immune to cold) with an attack that does 4 radiation damage at initiative 13
+1113 units each with 39287 hit points with an attack that does 69 fire damage at initiative 12
+1382 units each with 15277 hit points (weak to radiation, fire) with an attack that does 19 cold damage at initiative 2
+2101 units each with 25567 hit points with an attack that does 17 slashing damage at initiative 10
diff --git a/day25 b/day25
new file mode 100644
index 0000000..761b364
--- /dev/null
+++ b/day25
@@ -0,0 +1,1315 @@
+-7,1,-6,1
+-4,-2,2,2
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+0,5,-4,-2
+-1,-4,4,1
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diff --git a/day25.rb b/day25.rb
new file mode 100644
index 0000000..5b51602
--- /dev/null
+++ b/day25.rb
@@ -0,0 +1,34 @@
+d = File.readlines("day25").map { |x| x.split(",").map(&:to_i) }
+
+class DSU
+
+  def initialize(x)
+    @array = Array.new(x) {|i| i }
+  end
+
+  def find(x)
+    return x if @array[x] == x
+    @array[x] = find(@array[x])
+  end
+
+  def union(a, b)
+    @array[find(a)] = @array[find(b)]
+  end
+
+  def sets
+    @array.collect{ |i| find(i) }.uniq.length
+  end
+  
+end
+
+dsu = DSU.new(d.size)
+
+(0...d.size).each { |i|
+  (i+1...d.size).each { |j|
+    if d[i].zip(d[j]).map { |(a,b)| (a-b).abs }.sum <= 3
+      dsu.union(i, j)
+    end
+  }
+}
+
+p dsu.sets