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46 lines
1.1 KiB
46 lines
1.1 KiB
// Copyright 2010 Petar Maymounkov. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package llrb
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// GetHeight() returns an item in the tree with key @key, and it's height in the tree
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func (t *LLRB) GetHeight(key Item) (result Item, depth int) {
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return t.getHeight(t.root, key)
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}
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func (t *LLRB) getHeight(h *Node, item Item) (Item, int) {
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if h == nil {
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return nil, 0
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}
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if less(item, h.Item) {
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result, depth := t.getHeight(h.Left, item)
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return result, depth + 1
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}
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if less(h.Item, item) {
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result, depth := t.getHeight(h.Right, item)
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return result, depth + 1
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}
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return h.Item, 0
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}
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// HeightStats() returns the average and standard deviation of the height
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// of elements in the tree
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func (t *LLRB) HeightStats() (avg, stddev float64) {
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av := &avgVar{}
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heightStats(t.root, 0, av)
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return av.GetAvg(), av.GetStdDev()
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}
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func heightStats(h *Node, d int, av *avgVar) {
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if h == nil {
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return
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}
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av.Add(float64(d))
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if h.Left != nil {
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heightStats(h.Left, d+1, av)
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}
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if h.Right != nil {
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heightStats(h.Right, d+1, av)
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}
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}
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