From 69a8c7bb9862966b2f21dbb61e86f652f9b238f9 Mon Sep 17 00:00:00 2001 From: Marcin Chrzanowski Date: Fri, 25 Dec 2020 15:27:26 +0100 Subject: Add day 11 --- 11/a.rb | 51 ++++++++++++++++++++++++++++++++ 11/b.rb | 58 +++++++++++++++++++++++++++++++++++++ 11/input.txt | 95 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 204 insertions(+) create mode 100644 11/a.rb create mode 100644 11/b.rb create mode 100644 11/input.txt diff --git a/11/a.rb b/11/a.rb new file mode 100644 index 0000000..7aa7f43 --- /dev/null +++ b/11/a.rb @@ -0,0 +1,51 @@ +input = File.readlines('input.txt').map { |l| ".#{l.chomp}.".split '' } +input.unshift(['.'] * input[0].length) +input.push(['.'] * input[0].length) + +next_map = [] +input.size.times do + row = [] + input[0].size.times do + row.push '.' + end + next_map.push row +end + +changed = true +current_count = 0 +while changed + current_count = 0 + changed = false + (1...input.length-1).each do |i| + (1...input[0].length-1).each do |j| + if input[i][j] != '.' + count = 0 + (-1..1).each do |di| + (-1..1).each do |dj| + if !(di == 0 && dj == 0) + count += input[i+di][j+dj] == '#' ? 1 : 0 + end + end + end + + if count == 0 && input[i][j] == 'L' + next_map[i][j] = '#' + changed = true + elsif count >= 4 && input[i][j] == '#' + next_map[i][j] = 'L' + changed = true + else + next_map[i][j] = input[i][j] + end + + current_count += next_map[i][j] == '#' ? 1 : 0 + end + end + end + + tmp = input + input = next_map + next_map = tmp +end + +puts current_count diff --git a/11/b.rb b/11/b.rb new file mode 100644 index 0000000..bc93bce --- /dev/null +++ b/11/b.rb @@ -0,0 +1,58 @@ +input = File.readlines('input.txt').map { |l| ".#{l.chomp}.".split '' } +input.unshift(['.'] * input[0].length) +input.push(['.'] * input[0].length) + +next_map = [] +input.size.times do + row = [] + input[0].size.times do + row.push '.' + end + next_map.push row +end + +changed = true +current_count = 0 +while changed + current_count = 0 + changed = false + (1...input.length-1).each do |i| + (1...input[0].length-1).each do |j| + if input[i][j] != '.' + count = 0 + (-1..1).each do |di| + (-1..1).each do |dj| + if !(di == 0 && dj == 0) + offset_i = i + di + offset_j = j + dj + while offset_i > 0 && offset_i < input.length - 1 && offset_j > 0 && offset_j < input[0].length - 1 && input[offset_i][offset_j] == '.' + offset_i += di + offset_j += dj + end + + count += input[offset_i][offset_j] == '#' ? 1 : 0 + end + end + end + + if count == 0 && input[i][j] == 'L' + next_map[i][j] = '#' + changed = true + elsif count >= 5 && input[i][j] == '#' + next_map[i][j] = 'L' + changed = true + else + next_map[i][j] = input[i][j] + end + + current_count += next_map[i][j] == '#' ? 1 : 0 + end + end + end + + tmp = input + input = next_map + next_map = tmp +end + +puts current_count diff --git a/11/input.txt b/11/input.txt new file mode 100644 index 0000000..8f2a9e1 --- /dev/null +++ b/11/input.txt @@ -0,0 +1,95 @@ 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+LLLLLLLL.LLLL.LLLLL.LLLLLLLL.LLLLL.LLLLLLL.LLLLLLLLLLLLLLLLLLLLL..LLLL.LLLL.L.LLLLLLL.LLLLLLLLLLLL +LLLLLLLL.LLLL.LLLLL.LLLLLLLL.L.LLL.LLLLLLLLLLLL.LLLLLLLLLLLLLLLL.LLLLL.LL.LLLL.LLLLLL.LLLLLLLLLLLL +LLLLLLL...LLLLLLLLL.LLLLLLLL.LL.LLLLLLLLLL.LLLLLL.LLLLL.LLLLLLLL.LLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLL +LLLLLLLLLLLLL.LLLLL.LLLLLLLLLLLLLL.LLLLLLL.LLLLLL.LLLL.LLLLLLLLLLLLLLL.L.LLLLLLLLLLLL.LLLLLLLLLLLL +LLLLLLLL.LLLLLL.LLL.LLLLLLLLLLLLLLLLLLLLLL.LLLLLL.LLLLLLLLLLLLLL.LLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLL -- cgit v1.2.3