From 7cadfc7ce07f30f21447f3a1b748af8a59cf0703 Mon Sep 17 00:00:00 2001 From: Marcin Chrzanowski Date: Fri, 25 Dec 2020 15:31:15 +0100 Subject: Add day 14 --- 14/a.rb | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 14/a.rb (limited to '14/a.rb') diff --git a/14/a.rb b/14/a.rb new file mode 100644 index 0000000..6dfab22 --- /dev/null +++ b/14/a.rb @@ -0,0 +1,41 @@ +lines = File.readlines('input.txt') + +one_mask = 0 +zero_mask = (1 << 36) - 1 + +mem = Hash.new 0 + +lines.each do |line| + if line.slice(0, 4) == 'mask' + mask = line.split(' = ')[1].strip + one_mask = 2 + zero_mask = 3 + mask.each_char do |c| + case c + when '1' + one_mask += 1 + when '0' + zero_mask -= 1 + end + one_mask *= 2 + zero_mask *= 2 + zero_mask += 1 + end + one_mask >>= 1 + zero_mask >>= 1 + else + split = line.split(/\[|\] = /) + address = split[1].to_i + value = split[2].to_i + actual_value = (value & zero_mask) | one_mask + mem[address] = actual_value + end +end + +sum = 0 +mem.each_value do |v| + sum += v + sum -= 1 << 36 +end + +puts sum -- cgit v1.2.3