diff --git a/.idea/rubyexplorer.iml b/.idea/rubyexplorer.iml index f64b9a0..f3bef6d 100644 --- a/.idea/rubyexplorer.iml +++ b/.idea/rubyexplorer.iml @@ -11,5 +11,7 @@ + + \ No newline at end of file diff --git a/src/advent/day3.rb b/src/advent/day3.rb new file mode 100644 index 0000000..4e86af7 --- /dev/null +++ b/src/advent/day3.rb @@ -0,0 +1,137 @@ +# frozen_string_literal: true + +def group_neighbour(lst, &block) + if lst.empty? + return [] + end + ret = [[lst[0]]] + lst.each_cons(2) do |first_and_second| + first, second = first_and_second + if block.call first, second + ret[-1].append second + else + ret.append [second] + end + end + ret +end + +class EngineNumber + def initialize(line_index, start, end_, value) + @line_index = line_index + @start = start + @end_ = end_ + @value = value + end + + + attr_accessor :line_index + attr_accessor :start + attr_accessor :end_ + attr_accessor :value + +end + +class EngineLine + def initialize(idx, line) + @idx = idx + @line = line + end + + def is_symbols?(letter) + unless letter + return false + end + "1234567890.".index(letter) == nil + end + + def has_any_symbols_at(indexes) + indexes.any? do |idx| + is_symbols? @line[idx] + end + end + + def extract_digit_indexes(word) + digit_indexes = [] + word.split("").each_with_index do |letter, index| + if "0123456789".index letter + digit_indexes.append index + end + end + digit_indexes + end + + def group_digit_indexes(digit_indexes) + group_neighbour(digit_indexes) {|x, y| y == x + 1} + end + + def create_engine_number(digit_group) + start = digit_group.min + end_ = 1 + digit_group.max + value = @line[start...end_].to_i + EngineNumber.new @idx, start, end_, value + end + + def extract_engine_numbers + digit_indexes = extract_digit_indexes @line + group_digit_indexes(digit_indexes).map &method(:create_engine_number) + end + +end + +class Engine + def initialize(engine_lines) + @engine_lines = engine_lines + end + + def self.deserialize(ser) + els = ser.strip.split("\n").each_with_index.map { |line, idx| EngineLine.new idx, line} + return self.new els + end + + def extract_engine_numbers + @engine_lines + .map {|line| line.extract_engine_numbers} + .flatten + end + + def has_symbol?(line_index, indexes_in_line) + # indexes_in_line = indexes_in_line || [] + # puts "> #{ indexes_in_line }" + @engine_lines[line_index]&.has_any_symbols_at indexes_in_line + end + + def get_engine_number_neighbourhood(engine_number) + line_index = engine_number.line_index + [ + {line_index: line_index, indexes_in_line: ((engine_number.start-1)..(engine_number.start-1))}, + {line_index: line_index, indexes_in_line: ((engine_number.end_)..(engine_number.end_))}, + {line_index: line_index - 1 , indexes_in_line: ((engine_number.start - 1)...(engine_number.end_+1))}, + {line_index: line_index + 1 , indexes_in_line: ((engine_number.start - 1)...(engine_number.end_+1))}, + ] + + end + + def touches_symbol?(engine_number) + get_engine_number_neighbourhood(engine_number).map do |h| + has_symbol?(h[:line_index], h[:indexes_in_line]) + end + .any? + end + + def extract_engine_numbers_that_touches_symbols + extract_engine_numbers.filter {|engine_number| touches_symbol? engine_number} + end + + attr_accessor :engine_lines +end + + +input_file_name = File.join(File.dirname(__FILE__), "day_3_input.txt") + +input_content = File.open(input_file_name).read + +engine = Engine.deserialize input_content + +puts engine.extract_engine_numbers_that_touches_symbols.map {|e| e.value} .sum + diff --git a/src/advent/day3_test.rb b/src/advent/day3_test.rb new file mode 100644 index 0000000..c0d9689 --- /dev/null +++ b/src/advent/day3_test.rb @@ -0,0 +1,105 @@ +# frozen_string_literal: true + +require 'test/unit' +require_relative './day3' + +class Day3Test < Test::Unit::TestCase + def test_group_neighbour_empty + ret = group_neighbour([]) {|x, y| x + 1 == y} + assert_empty ret + end + + def test_group_neighbour + input = [3,5,6,7,1,2,4,1,1] + ret = group_neighbour(input) do |x, y| + y == x + 1 + end + expt = [[3],[5,6,7],[1,2],[4],[1],[1]] + assert_equal expt, ret + end + + def test_experiments + word = "hello" + lst = [0, 1, 2] + assert_equal lst[-1], 2 + + assert_equal (0..2).to_a, [0, 1, 2] + + assert_true [1, 2, 3, 0].all? + + assert_equal (1..1).to_a, [1] + + assert_equal "hello"[4..10], "o" + + + + end +end + + +class EngineLineTest < Test::Unit::TestCase + + @@easy_engine = " +467..114.. +...*...... +..35..633. +......#... +617*...... +.....+.58. +..592..... +......755. +...$.*.... +.664.598.." + def test_extract_numbers + engine = EngineLine.new 33, ".664.598.." + engine_numbers = engine.extract_engine_numbers + assert_equal 2, engine_numbers.length + assert_equal engine_numbers[0].start, 1 + assert_equal engine_numbers[0].line_index, 33 + assert_equal engine_numbers[0].end_, 1 + 3 + assert_equal engine_numbers[0].value, 664 + end + + def test_extract_engine_numbers + engine = Engine.deserialize @@easy_engine + expt = [467, 114, 35, 633, 617, 58, 592, 755, 664, 598] + assert_equal expt, engine.extract_engine_numbers.map {|e| e.value} + end + + def test_touches_symbol + engine = Engine.deserialize @@easy_engine + engine_number = engine.extract_engine_numbers[0] + assert_true engine.touches_symbol? engine_number + end + + def test_extract_engine_numbers_that_touches_symbols + engine = Engine.deserialize @@easy_engine + expt = [467, 35, 633, 617, 592, 755, 664, 598] + assert_equal expt, engine.extract_engine_numbers_that_touches_symbols.map {|e| e.value} + end + + def test_empty + input = " +.......... +.......... +.......... +.......... +.......... +.......... +.......... +.......... +.......... +.........." + engine = Engine.deserialize input + expt = [] + assert_equal expt, engine.extract_engine_numbers_that_touches_symbols.map {|e| e.value} + end + + + def test_day_3_part_1_easy + engine = Engine.deserialize @@easy_engine + expt = 4361 + assert_equal expt, engine.extract_engine_numbers_that_touches_symbols.map {|e| e.value} .sum + end + +end \ No newline at end of file diff --git a/src/advent/day_3_input.txt b/src/advent/day_3_input.txt new file mode 100644 index 0000000..4c9a7f3 --- /dev/null +++ b/src/advent/day_3_input.txt @@ -0,0 +1,140 @@ +48.................501....33.....622..............763.........331.................161.683......................................980.......... +...491.842.....948*..................338.....*......=...........-...309.......633*....*....................*990...706...452......*..+....... +...*...*....................426........*..408.........................*............659...............250.........&.......*.....767...403.... +363.....961...959#.508*223......843.406..........690................%..479.....................398.../....*............458.................. 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