forked from Mirror/wren
61 lines
1.2 KiB
Plaintext
61 lines
1.2 KiB
Plaintext
// Ported from the Python version.
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class Tree {
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new(item, depth) {
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_item = item
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if (depth > 0) {
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var item2 = item + item
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depth = depth - 1
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_left = new Tree(item2 - 1, depth)
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_right = new Tree(item2, depth)
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}
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}
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check {
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if (_left == null) {
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return _item
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}
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return _item + _left.check - _right.check
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}
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}
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var minDepth = 4
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var maxDepth = 12
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var stretchDepth = maxDepth + 1
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var start = OS.clock
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IO.write("stretch tree of depth " + stretchDepth.toString + " check: " +
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new Tree(0, stretchDepth).check.toString)
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var longLivedTree = new Tree(0, maxDepth)
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// iterations = 2 ** maxDepth
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var iterations = 1
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var d = 0
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while (d < maxDepth) {
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iterations = iterations * 2
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d = d + 1
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}
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var depth = minDepth
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while (depth < stretchDepth) {
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var check = 0
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var i = 1
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while (i < iterations + 1) {
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check = check + new Tree(i, depth).check + new Tree(-i, depth).check
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i = i + 1
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}
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IO.write((iterations * 2).toString + " trees of depth " + depth.toString +
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" check: " + check.toString)
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iterations = iterations / 4
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depth = depth + 2
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}
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IO.write("long lived tree of depth " + maxDepth.toString + " check: " +
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longLivedTree.check.toString)
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IO.write("elapsed: " + (OS.clock - start).toString)
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