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# The Computer Language Shootout Benchmarks
# http://shootout.alioth.debian.org
#
# contributed by Jesse Millikan
# disable output
def STDOUT.write_ *args
end
def item_check(tree)
if tree[0] == nil
tree[1]
else
tree[1] + item_check(tree[0]) - item_check(tree[2])
end
end
def bottom_up_tree(item, depth)
if depth > 0
item_item = 2 * item
depth -= 1
[bottom_up_tree(item_item - 1, depth), item, bottom_up_tree(item_item, depth)]
else
[nil, item, nil]
end
end
max_depth = 12 # 16 # ARGV[0].to_i
min_depth = 4
max_depth = min_depth + 2 if min_depth + 2 > max_depth
stretch_depth = max_depth + 1
stretch_tree = bottom_up_tree(0, stretch_depth)
puts "stretch tree of depth #{stretch_depth}\t check: #{item_check(stretch_tree)}"
stretch_tree = nil
long_lived_tree = bottom_up_tree(0, max_depth)
min_depth.step(max_depth + 1, 2) do |depth|
iterations = 2**(max_depth - depth + min_depth)
check = 0
for i in 1..iterations
temp_tree = bottom_up_tree(i, depth)
check += item_check(temp_tree)
temp_tree = bottom_up_tree(-i, depth)
check += item_check(temp_tree)
end
puts "#{iterations * 2}\t trees of depth #{depth}\t check: #{check}"
end
puts "long lived tree of depth #{max_depth}\t check: #{item_check(long_lived_tree)}"
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