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.
51 lines
1.1 KiB
51 lines
1.1 KiB
Row = Struct.new(:tiles) do
|
|
INPUT_MAP = { ?. => :safe, ?^ => :trap }
|
|
|
|
def self.from_s(input)
|
|
new(input.chars.map {|char| INPUT_MAP.fetch(char) })
|
|
end
|
|
|
|
def next
|
|
self.class.new(
|
|
%i[ safe safe ].insert(1, *tiles).each_cons(3).map {|l,c,r|
|
|
if l == :trap && c == :trap && r == :safe
|
|
:trap
|
|
elsif l == :safe && c == :trap && r == :trap
|
|
:trap
|
|
elsif l == :trap && c == :safe && r == :safe
|
|
:trap
|
|
elsif l == :safe && c == :safe && r == :trap
|
|
:trap
|
|
else
|
|
:safe
|
|
end
|
|
}
|
|
)
|
|
end
|
|
end
|
|
|
|
if __FILE__ == $0
|
|
row = Row.from_s(DATA.read.chomp)
|
|
count = 0
|
|
400_000.times do
|
|
count += row.tiles.count(:safe)
|
|
row = row.next
|
|
end
|
|
p count
|
|
end
|
|
|
|
require 'minitest'
|
|
# require 'minitest/autorun'
|
|
|
|
class TestRow < Minitest::Test
|
|
def test_row
|
|
row = Row.from_s('..^^.')
|
|
assert_equal %i[ safe safe trap trap safe ], row.tiles
|
|
|
|
assert_equal Row.from_s('.^^^^'), row.next
|
|
end
|
|
end
|
|
|
|
__END__
|
|
^^.^..^.....^..^..^^...^^.^....^^^.^.^^....^.^^^...^^^^.^^^^.^..^^^^.^^.^.^.^.^.^^...^^..^^^..^.^^^^
|