41 lines
755 B
Crystal
41 lines
755 B
Crystal
INPUT = File.read("day2.txt").lines.map(&.chomp)
|
|
|
|
def parse(line)
|
|
data = line.match(/([0-9]+)-([0-9]+) ([a-z]): ([a-z]+)/)
|
|
data.try do |data|
|
|
min = data[1].to_i
|
|
max = data[2].to_i
|
|
char = data[3][0]
|
|
str = data[4]
|
|
{min,max,char,str}
|
|
end
|
|
end
|
|
|
|
def part1
|
|
input = INPUT.clone
|
|
total = input.count do |line|
|
|
next false unless data = parse(line)
|
|
min, max, char, str = data
|
|
count = str.chars.count(char)
|
|
count >= min && count <= max
|
|
end
|
|
|
|
puts total
|
|
end
|
|
|
|
def part2
|
|
input = INPUT.clone
|
|
total = input.count do |line|
|
|
next false unless data = parse(line)
|
|
min, max, char, str = data
|
|
min -= 1
|
|
max -= 1
|
|
(str[min] == char) ^ (str[max] == char)
|
|
end
|
|
|
|
puts total
|
|
end
|
|
|
|
part1
|
|
part2
|