#! /usr/bin/env ruby

if ARGV.length != 1
        abort("Incorrect arguments - needs input file")
elsif not File.exist? (ARGV[0])
	abort("File #{ARGV[0]} did not exist")
end

file = ARGV[0]

maps = File.open(file, "r").each_line().map(&:chomp).chunk_while {|before, after| before.length == after.length}.filter {|chunk| chunk != [""]}.map {|chunk| chunk.map{|row| row.each_char.to_a}}

def find_reflection(data)
	candidate_start = data.each_cons(2).with_index.flat_map {|vals,idx| a,b = vals; a == b ? [idx] : []}
	valid_starts = candidate_start.flat_map do |start|
		pos = start
		reflected = start + 1
		match = true
		while pos > 0 and reflected < data.length - 1
			pos -= 1
			reflected += 1
			match = data[pos] == data[reflected]
			break unless match
		end
		match ? [start + 1] : []
	end
	valid_starts[0]
end

puts maps.flat_map {|data| [find_reflection(data).to_i * 100, find_reflection(data.transpose()).to_i]}.sum