Initial commit

6 files changed, 336 insertions, 0 deletions

diff --git a/day02/Dockerfile b/day02/Dockerfile
new file mode 100644
index 0000000..5e0a8b7
--- /dev/null
+++ b/day02/Dockerfile
@@ -0,0 +1,7 @@
+FROM ruby:2.5-slim
+
+WORKDIR /opt
+
+COPY . .
+
+ENTRYPOINT ["./entrypoint"]
diff --git a/day02/Makefile b/day02/Makefile
new file mode 100644
index 0000000..40af6b1
--- /dev/null
+++ b/day02/Makefile
@@ -0,0 +1,10 @@
+DAY = 02
+
+.PHONY: run
+
+run: build
+	sudo docker run -it --rm aoc2018day$(DAY)
+
+build:
+	sudo docker build -t aoc2018day$(DAY) .
+	touch build
diff --git a/day02/entrypoint b/day02/entrypoint
new file mode 100755
index 0000000..cff9f4c
--- /dev/null
+++ b/day02/entrypoint
@@ -0,0 +1,10 @@
+#!/bin/bash
+
+if [ -x part1 ] ; then
+	echo -ne "Part 1:\n\t"
+	./part1 < input
+fi
+if [ -x part2 ] ; then
+	echo -ne "Part 2:\n\t"
+	./part2 < input
+fi
diff --git a/day02/input b/day02/input
new file mode 100644
index 0000000..69850ae
--- /dev/null
+++ b/day02/input
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diff --git a/day02/part1 b/day02/part1
new file mode 100755
index 0000000..dca8ec2
--- /dev/null
+++ b/day02/part1
@@ -0,0 +1,26 @@
+#!/usr/bin/env ruby
+
+class Integer
+	def two?
+		self == 2
+	end
+	def three?
+		self == 3
+	end
+end
+
+input = $stdin.readlines.map(&:chomp)
+
+twos = 0
+threes = 0
+
+input.each do |i|
+	hash = Hash.new(0)
+	i.chars.each do |c|
+		hash[c] += 1
+	end
+	twos += 1 if hash.values.map(&:two?).any?
+	threes += 1 if hash.values.map(&:three?).any?
+end
+
+puts twos * threes
diff --git a/day02/part2 b/day02/part2
new file mode 100755
index 0000000..aa82247
--- /dev/null
+++ b/day02/part2
@@ -0,0 +1,33 @@
+#!/usr/bin/env ruby
+
+class String
+	def distance(other)
+		sa = self.chars
+		oa = other.chars
+		d = 0
+		(0...self.length).each do |i|
+			d += 1 if sa[i] != oa[i]
+		end
+		return d
+	end
+
+	def difference(other)
+		sa = self.chars
+		oa = other.chars
+		(0...self.length).each do |i|
+			sa[i] = nil if sa[i] != oa[i]
+		end
+		return sa.join
+	end
+end
+
+input = $stdin.readlines.map(&:chomp)
+
+(0...input.length).each do |i|
+	(i...input.length).each do |j|
+		if input[i].distance(input[j]) == 1
+			puts input[i].difference(input[j])
+			exit
+		end
+	end
+end