You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
36 lines
838 B
36 lines
838 B
def compare(left, right)
|
|
case [left, right]
|
|
in [left, nil]
|
|
1
|
|
in [Integer, Integer]
|
|
left <=> right
|
|
in [Array, Array]
|
|
left.zip(right).each do |left, right|
|
|
case compare(left, right)
|
|
when -1 then return -1
|
|
when 0 # no-op
|
|
when 1 then return 1
|
|
end
|
|
end
|
|
(left.size == right.size) ? 0 : -1
|
|
else
|
|
compare(Array(left), Array(right))
|
|
end
|
|
end
|
|
|
|
# part one
|
|
# pairs = ARGF.read.split("\n\n")
|
|
# pairs = pairs.map {|pair| pair.lines(chomp: true).map { eval(_1) }}
|
|
|
|
# p pairs.map.with_index {|(left,right),i|
|
|
# [compare(left, right), i+1]
|
|
# }.select {|cmp,_| cmp == -1 }.sum(&:last)
|
|
|
|
# part two
|
|
pairs = ARGF.read.lines(chomp: true).reject(&:empty?).map { eval(_1) }
|
|
pairs << [[2]] << [[6]]
|
|
pairs = pairs.sort { compare(_1, _2) }
|
|
a = pairs.index([[2]])
|
|
b = pairs.index([[6]])
|
|
p (a+1)*(b+1)
|