4 files changed, 220 insertions, 0 deletions
diff --git a/day11/input b/day11/input
new file mode 100644
index 0000000..3e490d2
--- /dev/null
+++ b/day11/input
@@ -0,0 +1,55 @@
+Monkey 0:
+  Starting items: 91, 54, 70, 61, 64, 64, 60, 85
+  Operation: new = old * 13
+  Test: divisible by 2
+    If true: throw to monkey 5
+    If false: throw to monkey 2
+
+Monkey 1:
+  Starting items: 82
+  Operation: new = old + 7
+  Test: divisible by 13
+    If true: throw to monkey 4
+    If false: throw to monkey 3
+
+Monkey 2:
+  Starting items: 84, 93, 70
+  Operation: new = old + 2
+  Test: divisible by 5
+    If true: throw to monkey 5
+    If false: throw to monkey 1
+
+Monkey 3:
+  Starting items: 78, 56, 85, 93
+  Operation: new = old * 2
+  Test: divisible by 3
+    If true: throw to monkey 6
+    If false: throw to monkey 7
+
+Monkey 4:
+  Starting items: 64, 57, 81, 95, 52, 71, 58
+  Operation: new = old * old
+  Test: divisible by 11
+    If true: throw to monkey 7
+    If false: throw to monkey 3
+
+Monkey 5:
+  Starting items: 58, 71, 96, 58, 68, 90
+  Operation: new = old + 6
+  Test: divisible by 17
+    If true: throw to monkey 4
+    If false: throw to monkey 1
+
+Monkey 6:
+  Starting items: 56, 99, 89, 97, 81
+  Operation: new = old + 1
+  Test: divisible by 7
+    If true: throw to monkey 0
+    If false: throw to monkey 2
+
+Monkey 7:
+  Starting items: 68, 72
+  Operation: new = old + 8
+  Test: divisible by 19
+    If true: throw to monkey 6
+    If false: throw to monkey 0
diff --git a/day11/part1.rb b/day11/part1.rb
new file mode 100644
index 0000000..f4890bc
--- /dev/null
+++ b/day11/part1.rb
@@ -0,0 +1,66 @@
+class Monkey
+  def initialize(items, op, test, iftrue, iffalse)
+    @items = items
+    @op = op
+    @test = test
+    @iftrue = iftrue
+    @iffalse = iffalse
+    @inspections = 0
+  end
+
+  attr_reader :items, :inspections
+
+  def <<(item)
+    @items << item
+  end
+
+  def turn
+    @inspections += @items.count
+    ret = []
+    until @items.empty?
+      old = @items.shift
+      new = eval(@op) / 3
+      ret << [(new % @test == 0 ? @iftrue : @iffalse), new]
+    end
+    ret
+  end
+end
+
+class Game
+  def initialize
+    @monkeys = []
+  end
+
+  def <<(monkey)
+    @monkeys << monkey
+  end
+
+  def round
+    @monkeys.each do |monkey|
+      monkey.turn.each do |tom, val|
+        @monkeys[tom] << val
+      end
+    end
+  end
+
+  def inspections
+    @monkeys.map(&:inspections)
+  end
+end
+
+lines = $stdin.readlines.map(&:strip).reject(&:empty?)
+
+game = Game.new
+lines.each_slice(6) do |mkls|
+  items = mkls[1].scan(/\d+/).map(&:to_i)
+  op = mkls[2].split(" = ")[1]
+  test = mkls[3].scan(/\d+/)[0].to_i
+  ift = mkls[4].scan(/\d+/)[0].to_i
+  iff = mkls[5].scan(/\d+/)[0].to_i
+  game << Monkey.new(items, op, test, ift, iff)
+end
+
+20.times do
+  game.round
+end
+puts game.inspections.max(2).inject(&:*)
diff --git a/day11/part2.rb b/day11/part2.rb
new file mode 100644
index 0000000..0be5a5c
--- /dev/null
+++ b/day11/part2.rb
@@ -0,0 +1,72 @@
+class Monkey
+  def initialize(items, op, test, iftrue, iffalse)
+    @items = items
+    @op = op
+    @test = test
+    @iftrue = iftrue
+    @iffalse = iffalse
+    @inspections = 0
+  end
+
+  attr_reader :items, :inspections
+
+  def <<(item)
+    @items << item
+  end
+
+  def turn(wl)
+    @inspections += @items.count
+    ret = []
+    until @items.empty?
+      old = @items.shift
+      new = eval(@op) % wl
+      ret << [(new % @test == 0 ? @iftrue : @iffalse), new]
+    end
+    ret
+  end
+end
+
+class Game
+  def initialize
+    @monkeys = []
+    @worry_limit = 1
+  end
+
+  attr_accessor :worry_limit
+
+  def <<(monkey)
+    @monkeys << monkey
+  end
+
+  def round
+    @monkeys.each do |monkey|
+      monkey.turn(@worry_limit).each do |tom, val|
+        @monkeys[tom] << val
+      end
+    end
+  end
+
+  def inspections
+    @monkeys.map(&:inspections)
+  end
+end
+
+lines = $stdin.readlines.map(&:strip).reject(&:empty?)
+
+game = Game.new
+wl = 1
+lines.each_slice(6) do |mkls|
+  items = mkls[1].scan(/\d+/).map(&:to_i)
+  op = mkls[2].split(" = ")[1]
+  test = mkls[3].scan(/\d+/)[0].to_i
+  wl *= test
+  ift = mkls[4].scan(/\d+/)[0].to_i
+  iff = mkls[5].scan(/\d+/)[0].to_i
+  game << Monkey.new(items, op, test, ift, iff)
+end
+game.worry_limit = wl
+
+10_000.times do |i|
+  game.round
+end
+puts game.inspections.max(2).inject(&:*)
diff --git a/day11/test b/day11/test
new file mode 100644
index 0000000..30e09e5
--- /dev/null
+++ b/day11/test
@@ -0,0 +1,27 @@
+Monkey 0:
+  Starting items: 79, 98
+  Operation: new = old * 19
+  Test: divisible by 23
+    If true: throw to monkey 2
+    If false: throw to monkey 3
+
+Monkey 1:
+  Starting items: 54, 65, 75, 74
+  Operation: new = old + 6
+  Test: divisible by 19
+    If true: throw to monkey 2
+    If false: throw to monkey 0
+
+Monkey 2:
+  Starting items: 79, 60, 97
+  Operation: new = old * old
+  Test: divisible by 13
+    If true: throw to monkey 1
+    If false: throw to monkey 3
+
+Monkey 3:
+  Starting items: 74
+  Operation: new = old + 3
+  Test: divisible by 17
+    If true: throw to monkey 0
+    If false: throw to monkey 1