gistfile1.rb

M = 'M'
o = 'o'
X = 'X'

world = [
[o,o,o,o,o,M,o,o,o,o,o],
[o,o,o,o,M,M,o,o,o,o,o],
[o,o,o,o,o,M,o,o,M,M,o],
[o,o,o,M,o,M,o,o,o,M,o],
[o,o,o,o,o,M,M,o,o,o,o],
[o,o,o,o,M,M,M,M,o,o,o],
[M,M,M,M,M,M,M,M,M,M,M],
[o,o,o,M,M,o,M,M,M,o,o],
[o,o,o,o,o,o,M,M,o,o,o],
[o,M,o,o,o,M,M,o,o,o,o],
[o,o,o,o,o,M,o,o,o,o,o]]

def map(world)
  world.map(&:join).join("\n")
end

def stack_trace(world, x, y)
  puts "\n\nLooking at tile (#{x},#{y})"
  puts map(world)
end

def continent_size world, x ,y
  stack_trace world, x, y
  
  if x < 0 or x > 10 or y < 0 or y > 10
    return 0
  end

  if world[y][x] != M
    return 0
  end

  size = 1
  world [y][x] = X

  size = size + continent_size(world, x-1, y-1)
  size = size + continent_size(world, x , y-1)
  size = size + continent_size(world, x+1, y-1)
  size = size + continent_size(world, x-1, y )
  size = size + continent_size(world, x+1, y )
  size = size + continent_size(world, x-1, y+1)
  size = size + continent_size(world, x , y+1)
  size = size + continent_size(world, x+1, y+1)
  size

end

puts continent_size(world, 5, 5)