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def range(s)
n1, n2 = s.split('-')
return n1.to_i .. n2.to_i
end
def read_pairs(filename)
retval = []
File.open(filename) do |file|
file.readlines.each do |line|
elf1, elf2 = line.split(',')
retval << [range(elf1), range(elf2)]
end
end
return retval
end
def range_included(r1, r2)
return (r2.include?(r1.first) && r2.include?(r1.last)) || (r1.include?(r2.first) && r1.include?(r2.last))
end
def range_overlaps(r1, r2)
return (r2.include?(r1.first) || r2.include?(r1.last)) || (r1.include?(r2.first) || r1.include?(r2.last))
end
def part1(filename)
read_pairs(filename).map { |pairs|
range_included(pairs[0], pairs[1])
}.select { |x| x }.count
end
def part2(filename)
read_pairs(filename).map { |pairs|
range_overlaps(pairs[0], pairs[1])
}.select { |x| x }.count
end
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