# Rivers born in mountain snow
# Seek paths to distant seas
def flow(waters)
  return waters if waters.length <= 1
  
  # Waters part at stone and ice
  middle = waters.length / 2
  left, right = waters.take(middle), waters.drop(middle)
  
  # Through valleys they wind deep
  left_flow = flow(left)
  right_flow = flow(right)
  
  # Below to meet as one again
  # Dancing toward the sea
  left_flow.merge(right_flow)
end

Mountain Streams

# green shoots pierce the earth
# tender branches spread their wings
# reaching for the sky
class TreeNode
  attr_accessor :left, :right
  def initialize; end
end

# leaf by leaf we trace
# through the garden's branching paths
# wisdom waits for us
def traverse(node)           
  return if node.nil?        
  traverse(node.left)        
  visit_node(node)          
  traverse(node.right)       
end

# one path leads to two
# each branch holds a secret now
# truth flows back to root
def visit_node(node)
  yield node if block_given?
  nil
end

# our garden grows here
# seedlings form their patterns new
# walk the path and bloom
root = TreeNode.new
root.left = TreeNode.new
root.right = TreeNode.new
root.left.right = TreeNode.new

puts "  🌱"
puts " / \\"
puts "🌱  🌱"
puts " \\"
puts "  🌱"

puts
traverse(root) { |node| print "🍃 " }
puts

#algorithms