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day 3 complete

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Guido Schweizer 2023-12-03 17:52:16 +01:00
parent 886800afcb
commit 69243552de
5 changed files with 387 additions and 0 deletions
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...............764.....................................488.....880.209........416..................183...156..........917...................

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#prepare the input which is a string containing new lines
def parse(input)
data = []
row = 0
symbols = {}
numbers = []
input.each_line do |line|
start_num = false
num = ""
num_cols = []
line.chomp.chars.each_with_index do |c,col|
if c == "."
if start_num
# finish a number
numbers << [num.to_i, row, num_cols]
start_num = false
num = ""
num_cols = []
end
elsif /\d/.match?(c)
# a digit
start_num = true
num += c
num_cols << col
else
# symbol
if start_num
# finish a number
numbers << [num.to_i, row, num_cols]
start_num = false
num = ""
num_cols = []
end
# fill adjacents
symbols[row] = {} if symbols[row].nil?
symbols[row][col-1] = true
symbols[row][col+1] = true
symbols[row-1] = {} if symbols[row-1].nil?
symbols[row-1][col] = true
symbols[row-1][col-1] = true
symbols[row-1][col+1] = true
symbols[row+1] = {}if symbols[row+1].nil?
symbols[row+1][col] = true
symbols[row+1][col-1] = true
symbols[row+1][col+1] = true
end
end
if start_num
# finish a number
numbers << [num.to_i, row, num_cols]
start_num = false
num = ""
num_cols = []
end
row += 1
end
data = [symbols,numbers]
data
end
# result should a single string or integer
def calculate(data)
result = ""
symbols, numbers = data
selected_numbers = []
numbers.each do |number_set|
number, row, cols = number_set
cols.each do |col|
if symbols.dig(row,col)
selected_numbers << number
puts "selected: #{selected_numbers}"
break
end
end
end
result = selected_numbers.reduce(&:+)
result
end

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#prepare the input which is a string containing new lines
def parse(input)
data = []
row = 0
symbols = []
numbers = []
input.each_line do |line|
start_num = false
num = ""
num_cols = []
line.chomp.chars.each_with_index do |c,col|
if c == "."
if start_num
# finish a number
numbers << [num.to_i, row, num_cols]
start_num = false
num = ""
num_cols = []
end
elsif /\d/.match?(c)
# a digit
start_num = true
num += c
num_cols << col
elsif c == "*"
# symbol
if start_num
# finish a number
numbers << [num.to_i, row, num_cols]
start_num = false
num = ""
num_cols = []
end
# fill adjacents
symbols << [row,col]
else
# other symbol
if start_num
# finish a number
numbers << [num.to_i, row, num_cols]
start_num = false
num = ""
num_cols = []
end
end
end
if start_num
# finish a number
numbers << [num.to_i, row, num_cols]
start_num = false
num = ""
num_cols = []
end
row += 1
end
data = [symbols,numbers]
data
end
def find_adjacent_numbers(row,col,numbers)
adjacents = []
matches = [
[row-1,col-1],
[row-1,col,],
[row-1,col+1],
[row,col-1],
[row,col+1],
[row+1,col-1],
[row+1,col],
[row+1,col+1]
]
numbers.each do |number|
num, row, cols = number
cols.each do |col|
if matches.include? [row,col]
adjacents << num
break
end
end
end
adjacents
end
# result should a single string or integer
def calculate(data)
result = ""
symbols, numbers = data
selected_numbers = []
symbols.each do |symbol|
row,col = symbol
adj = find_adjacent_numbers(row,col,numbers)
if adj.length == 2
selected_numbers << adj.first * adj.last
end
end
result = selected_numbers.reduce(&:+)
result
end

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if ARGV[0] == "2"
require_relative "impl_2"
else
require_relative "impl"
end
def print(result)
if result.is_a? Array
result.map! {|l| "#{l}\n" }
end
puts result
end
def run
puts "running your implementation"
input = File.new("day_3/data").read
data = parse(input)
result = calculate(data)
print(result)
end
run

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if ARGV[0] == "2"
require_relative "impl_2"
RESULT = 467835
else
require_relative "impl"
RESULT = 4361
end
INPUT = <<~IN
467..114..
...*......
..35..633.
......#...
617*......
.....+.58.
..592.....
......755.
...$.*....
.664.598..
IN
def test_example
parsed = parse(INPUT)
result = calculate(parsed)
if result == RESULT
puts "Test successful. Now run with real input"
puts "ruby day_3/run.rb #{ARGV[0]}"
else
puts "Test failed"
puts "expected \"#{RESULT}\" got \"#{result}\""
end
end
test_example