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75feee0968
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@13944 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
57 lines
1.2 KiB
Ruby
57 lines
1.2 KiB
Ruby
# The Computer Language Shootout Benchmarks
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# http://shootout.alioth.debian.org
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#
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# contributed by Jesse Millikan
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# disable output
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def STDOUT.write_ *args
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end
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def item_check(tree)
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if tree[0] == nil
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tree[1]
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else
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tree[1] + item_check(tree[0]) - item_check(tree[2])
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end
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end
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def bottom_up_tree(item, depth)
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if depth > 0
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item_item = 2 * item
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depth -= 1
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[bottom_up_tree(item_item - 1, depth), item, bottom_up_tree(item_item, depth)]
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else
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[nil, item, nil]
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end
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end
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max_depth = 12 # 16 # ARGV[0].to_i
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min_depth = 4
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max_depth = min_depth + 2 if min_depth + 2 > max_depth
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stretch_depth = max_depth + 1
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stretch_tree = bottom_up_tree(0, stretch_depth)
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puts "stretch tree of depth #{stretch_depth}\t check: #{item_check(stretch_tree)}"
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stretch_tree = nil
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long_lived_tree = bottom_up_tree(0, max_depth)
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min_depth.step(max_depth + 1, 2) do |depth|
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iterations = 2**(max_depth - depth + min_depth)
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check = 0
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for i in 1..iterations
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temp_tree = bottom_up_tree(i, depth)
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check += item_check(temp_tree)
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temp_tree = bottom_up_tree(-i, depth)
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check += item_check(temp_tree)
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end
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puts "#{iterations * 2}\t trees of depth #{depth}\t check: #{check}"
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end
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puts "long lived tree of depth #{max_depth}\t check: #{item_check(long_lived_tree)}"
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