From 423d2bcb74df7290d2d7e8d3d4aaea278cd1e98b Mon Sep 17 00:00:00 2001
From: Nat Lasseter <user@4574.co.uk>
Date: Mon, 2 Dec 2019 12:58:09 +0000
Subject: Day 02, though it's not going to sclae whell when we add more
 instructions!

---
 day02/Dockerfile |  7 +++++++
 day02/Makefile   | 13 +++++++++++++
 day02/entrypoint | 13 +++++++++++++
 day02/input      |  1 +
 day02/part1      | 28 ++++++++++++++++++++++++++++
 day02/part2      | 43 +++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 105 insertions(+)
 create mode 100644 day02/Dockerfile
 create mode 100644 day02/Makefile
 create mode 100755 day02/entrypoint
 create mode 100644 day02/input
 create mode 100755 day02/part1
 create mode 100755 day02/part2

diff --git a/day02/Dockerfile b/day02/Dockerfile
new file mode 100644
index 0000000..e5adcb1
--- /dev/null
+++ b/day02/Dockerfile
@@ -0,0 +1,7 @@
+FROM ruby:2.6.5-slim
+
+WORKDIR /opt
+
+COPY . .
+
+ENTRYPOINT ["./entrypoint"]
diff --git a/day02/Makefile b/day02/Makefile
new file mode 100644
index 0000000..347e7e5
--- /dev/null
+++ b/day02/Makefile
@@ -0,0 +1,13 @@
+DAY = 02
+
+.PHONY: run clean
+
+run: build
+	docker run -it --rm aoc2019day$(DAY)
+
+build: part* input
+	docker build -t aoc2019day$(DAY) .
+	touch build
+
+clean:
+	rm -f build
diff --git a/day02/entrypoint b/day02/entrypoint
new file mode 100755
index 0000000..8982d21
--- /dev/null
+++ b/day02/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/day02/input b/day02/input
new file mode 100644
index 0000000..ac16973
--- /dev/null
+++ b/day02/input
@@ -0,0 +1 @@
+1,0,0,3,1,1,2,3,1,3,4,3,1,5,0,3,2,6,1,19,1,19,5,23,2,9,23,27,1,5,27,31,1,5,31,35,1,35,13,39,1,39,9,43,1,5,43,47,1,47,6,51,1,51,13,55,1,55,9,59,1,59,13,63,2,63,13,67,1,67,10,71,1,71,6,75,2,10,75,79,2,10,79,83,1,5,83,87,2,6,87,91,1,91,6,95,1,95,13,99,2,99,13,103,1,103,9,107,1,10,107,111,2,111,13,115,1,10,115,119,1,10,119,123,2,13,123,127,2,6,127,131,1,13,131,135,1,135,2,139,1,139,6,0,99,2,0,14,0
diff --git a/day02/part1 b/day02/part1
new file mode 100755
index 0000000..460b3b5
--- /dev/null
+++ b/day02/part1
@@ -0,0 +1,28 @@
+#!/usr/bin/env ruby
+
+$input = $stdin.readlines[0].strip.split(",").map(&:to_i)
+$pc = 0
+
+def handle_code
+  case $input[$pc]
+  when 1
+    $input[$input[$pc+3]] = $input[$input[$pc+1]] + $input[$input[$pc+2]]
+    return true
+  when 2
+    $input[$input[$pc+3]] = $input[$input[$pc+1]] * $input[$input[$pc+2]]
+    return true
+  when 99
+    return false
+  end
+end
+
+$input[1] = 12
+$input[2] = 2
+
+loop do
+  continue = handle_code
+  break unless continue
+  $pc += 4
+end
+
+puts $input[0]
diff --git a/day02/part2 b/day02/part2
new file mode 100755
index 0000000..aadb860
--- /dev/null
+++ b/day02/part2
@@ -0,0 +1,43 @@
+#!/usr/bin/env ruby
+
+Input = $stdin.readlines[0].strip.split(",").map(&:to_i)
+
+noun = 0
+verb = 0
+
+loop do
+  $input = Input.dup
+  $input[1] = noun
+  $input[2] = verb
+
+  $pc = 0
+
+  def handle_code
+    case $input[$pc]
+    when 1
+      $input[$input[$pc+3]] = $input[$input[$pc+1]] + $input[$input[$pc+2]]
+      return true
+    when 2
+      $input[$input[$pc+3]] = $input[$input[$pc+1]] * $input[$input[$pc+2]]
+      return true
+    when 99
+      return false
+    end
+  end
+
+  loop do
+    continue = handle_code
+    break unless continue
+    $pc += 4
+  end
+
+  break if $input[0] == 19690720
+
+  verb += 1
+  if verb == 100
+    verb = 0
+    noun += 1
+  end
+end
+
+puts (100 * noun) + verb
-- 
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