Initial commit, day01

3 files changed, 26 insertions, 0 deletions

diff --git a/day01/input b/day01/input
new file mode 100644
index 0000000..2cb3c24
--- /dev/null
+++ b/day01/input
@@ -0,0 +1 @@
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diff --git a/day01/part1 b/day01/part1
new file mode 100755
index 0000000..f230be3
--- /dev/null
+++ b/day01/part1
@@ -0,0 +1,12 @@
+#!/usr/bin/env ruby
+
+input = gets.chomp.chars.map(&:to_i)
+l = input.length
+
+sum = 0
+
+(0...l).each do |i|
+  sum += input[i] if input[i] == input[(i + 1) % l]
+end
+
+puts sum
diff --git a/day01/part2 b/day01/part2
new file mode 100755
index 0000000..c8356df
--- /dev/null
+++ b/day01/part2
@@ -0,0 +1,13 @@
+#!/usr/bin/env ruby
+
+input = gets.chomp.chars.map(&:to_i)
+l = input.length
+r = l / 2
+
+sum = 0
+
+(0...l).each do |i|
+  sum += input[i] if input[i] == input[(i + r) % l]
+end
+
+puts sum