From cb2cfa0ac23d7daf7f7eb601783adc5f30a35d67 Mon Sep 17 00:00:00 2001
From: Nat Lasseter <user@4574.co.uk>
Date: Thu, 19 Dec 2019 17:48:09 +0000
Subject: Day19 part1, runs forever. looks like an 'understanding the input'
 type problem.

---
 day19/Dockerfile |   7 ++++
 day19/Makefile   |  14 +++++++
 day19/entrypoint |  13 ++++++
 day19/input      |   1 +
 day19/part1      | 125 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 160 insertions(+)
 create mode 100644 day19/Dockerfile
 create mode 100644 day19/Makefile
 create mode 100755 day19/entrypoint
 create mode 100644 day19/input
 create mode 100755 day19/part1

diff --git a/day19/Dockerfile b/day19/Dockerfile
new file mode 100644
index 0000000..e5adcb1
--- /dev/null
+++ b/day19/Dockerfile
@@ -0,0 +1,7 @@
+FROM ruby:2.6.5-slim
+
+WORKDIR /opt
+
+COPY . .
+
+ENTRYPOINT ["./entrypoint"]
diff --git a/day19/Makefile b/day19/Makefile
new file mode 100644
index 0000000..6608373
--- /dev/null
+++ b/day19/Makefile
@@ -0,0 +1,14 @@
+DAY = 19
+
+.PHONY: run clean
+
+run: build
+	docker run -it --rm aoc2019day$(DAY)
+
+build: part* input
+	docker build -t aoc2019day$(DAY) .
+	touch build
+
+clean:
+	docker image rm -f aoc2019day$(DAY)
+	rm -f build
diff --git a/day19/entrypoint b/day19/entrypoint
new file mode 100755
index 0000000..8982d21
--- /dev/null
+++ b/day19/entrypoint
@@ -0,0 +1,13 @@
+#!/bin/bash
+
+if [ -x part1 ] ; then
+	echo -ne "Part 1:\n\t"
+	time ./part1 < input
+fi
+if [ -x part1 -a -x part2 ] ; then
+	echo
+fi
+if [ -x part2 ] ; then
+	echo -ne "Part 2:\n\t"
+	time ./part2 < input
+fi
diff --git a/day19/input b/day19/input
new file mode 100644
index 0000000..ad5bc2f
--- /dev/null
+++ b/day19/input
@@ -0,0 +1 @@
+109,424,203,1,21101,11,0,0,1105,1,282,21102,18,1,0,1105,1,259,2102,1,1,221,203,1,21102,1,31,0,1106,0,282,21101,0,38,0,1106,0,259,20102,1,23,2,21202,1,1,3,21101,0,1,1,21102,57,1,0,1105,1,303,2101,0,1,222,20102,1,221,3,20101,0,221,2,21102,259,1,1,21101,0,80,0,1106,0,225,21102,135,1,2,21101,0,91,0,1105,1,303,2102,1,1,223,21001,222,0,4,21102,259,1,3,21102,1,225,2,21101,0,225,1,21101,118,0,0,1106,0,225,20101,0,222,3,21101,0,12,2,21101,0,133,0,1106,0,303,21202,1,-1,1,22001,223,1,1,21102,1,148,0,1105,1,259,1202,1,1,223,21002,221,1,4,20102,1,222,3,21101,0,17,2,1001,132,-2,224,1002,224,2,224,1001,224,3,224,1002,132,-1,132,1,224,132,224,21001,224,1,1,21102,1,195,0,105,1,109,20207,1,223,2,21001,23,0,1,21101,0,-1,3,21101,214,0,0,1105,1,303,22101,1,1,1,204,1,99,0,0,0,0,109,5,1202,-4,1,249,21201,-3,0,1,22102,1,-2,2,22102,1,-1,3,21102,250,1,0,1106,0,225,21202,1,1,-4,109,-5,2106,0,0,109,3,22107,0,-2,-1,21202,-1,2,-1,21201,-1,-1,-1,22202,-1,-2,-2,109,-3,2105,1,0,109,3,21207,-2,0,-1,1206,-1,294,104,0,99,21201,-2,0,-2,109,-3,2105,1,0,109,5,22207,-3,-4,-1,1206,-1,346,22201,-4,-3,-4,21202,-3,-1,-1,22201,-4,-1,2,21202,2,-1,-1,22201,-4,-1,1,22102,1,-2,3,21101,0,343,0,1106,0,303,1105,1,415,22207,-2,-3,-1,1206,-1,387,22201,-3,-2,-3,21202,-2,-1,-1,22201,-3,-1,3,21202,3,-1,-1,22201,-3,-1,2,22101,0,-4,1,21102,384,1,0,1105,1,303,1106,0,415,21202,-4,-1,-4,22201,-4,-3,-4,22202,-3,-2,-2,22202,-2,-4,-4,22202,-3,-2,-3,21202,-4,-1,-2,22201,-3,-2,1,22102,1,1,-4,109,-5,2106,0,0
diff --git a/day19/part1 b/day19/part1
new file mode 100755
index 0000000..31220e5
--- /dev/null
+++ b/day19/part1
@@ -0,0 +1,125 @@
+#!/usr/bin/env ruby
+
+class Machine
+  def initialize(starting_memory = [])
+    @mem = starting_memory
+    @pc = 0
+    @halt = false
+    @buffered_input = []
+    @buffered_output = []
+    @relative_base = 0
+  end
+
+  def mem(start = 0, len = @mem.length)
+    @mem[start...(start + len)]
+  end
+
+  def halt!
+    @halt = true
+  end
+
+  def halt?
+    @halt
+  end
+
+  def buffer_input(x)
+    if x.is_a?(Array) then
+      @buffered_input += x
+    else
+      @buffered_input.push(x)
+    end
+  end
+
+  def buffered_output(flush = false)
+    t = @buffered_output
+    @buffered_output = [] if flush
+    t
+  end
+
+  def step
+    return if halt?
+
+    opcode = @mem[@pc] % 100
+
+    if opcode == 99 then
+      halt!
+      @pc += 1
+      return
+    end
+
+    p3, p2, p1 = ("%03d" % (@mem[@pc] / 100)).chars
+
+    l1w, l1r = get(p1, 1)
+    l2w, l2r = get(p2, 2) if [1,2,5,6,7,8].include?(opcode)
+    l3w, l3r = get(p3, 3) if [1,2,7,8].include?(opcode)
+
+    case opcode
+    when 1
+      @mem[l3w] = l1r + l2r
+      @pc += 4
+    when 2
+      @mem[l3w] = l1r * l2r
+      @pc += 4
+    when 3
+      @mem[l1w] = @buffered_input.shift
+      @pc += 2
+    when 4
+      @buffered_output.push(l1r)
+      @pc += 2
+    when 5
+      @pc = (l1r != 0 ? l2r : @pc + 3)
+    when 6
+      @pc = (l1r == 0 ? l2r : @pc + 3)
+    when 7
+      @mem[l3w] = (l1r < l2r ? 1 : 0)
+      @pc += 4
+    when 8
+      @mem[l3w] = (l1r == l2r ? 1 : 0)
+      @pc += 4
+    when 9
+      @relative_base += l1r
+      @pc += 2
+    end
+  end
+
+  def run
+    until halt? do
+      step
+    end
+  end
+
+  private
+
+  def get(p, a)
+    w = case p
+        when "0"
+          @mem[@pc + a]
+        when "2"
+          @relative_base + @mem[@pc + a]
+        end
+    r = case p
+        when "0"
+          @mem[@mem[@pc + a]]
+        when "1"
+          @mem[@pc + a]
+        when "2"
+          @mem[@relative_base + @mem[@pc + a]]
+        end
+    [w, r || 0]
+  end
+end
+
+input = $stdin.readlines[0].strip.split(",").map(&:to_i)
+
+count = 0
+50.times do |x|
+  50.times do |y|
+    m = Machine.new(input)
+    m.buffer_input(x)
+    m.buffer_input(y)
+    m.run
+    count += m.buffered_output.last
+  end
+end
+
+puts count
-- 
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