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Balanced Binary Search Trees
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Eunwoo Cho
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# 螻襴讀2 螻襴讀 蠍一 ろ磯 - 碁Μ & 碁Μ 螻襴讀 - 伎碁Μ 蠍磯蓋 螳 - 伎碁Μ - 蠏″ 伎碁Μ 蟲 - AVL 碁Μ 蟲
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Balanced Binary Search Trees
1.
Balanced BST and
AVL tree 伎 螻襴讀 伎 蠏 ″ 伎 碁Μ 蟲 螻襴讀2 螻襴讀 蠍一 ろ磯 2015.09.21 覦: 譟
2.
伎 碁Μ
(Binary Search Trees, BST) (Key)-螳(Value) ロ蠍 襭 蟲譟 伎 碁Μ (Binary tree) 伎 (Binary Search) 螻襴讀 -螳 殊 碁(Left node)螳 覿覈(Parent node)覲企 螻, るジ讓 碁 (Right node)螳 覿覈覲企
3.
伎 碁Μ
蟲 豕豐 豢螳 (key)-螳(value) 襭 碁(Root node)襦 襦 -螳 豢螳覃 (or 襭) 碁 觜蟲 蠏 り 碁 る慨 朱 殊 (Left node)朱 豢螳 蠏 り 碁 る慨 覃 るジ讓 (Right node)朱 豢螳 企 碁 企 -螳 朱 れ 觜蟲 る 螳 谿城蟆曙一 襭 碁覿 觜蟲覃 谿場螳
4.
碁Μ 碁 蟲
(key), 螳(value) 覿覈 碁, 殊 & るジ讓 碁襯 Leaf 碁語 殊 碁螳 讌 るジ讓 碁螳 讌 覿覈 碁 殊 語 覿覈 碁 るジ讓 語
5.
伎 蟆 碁Μ
碁Μ 譬一 蠏 襷讌 蟆曙 碁Μ (Height)螳 貉れ 磯 伎 螳覲旧°: O(n)
6.
蠏 ″ 伎
碁Μ Balanced Binary Search Tr ees 一危郁 曙, 磯 れる 蠏 讌 螳覲旧°: O(log n)
7.
AVL 碁Μ 豌
朱語 牛 覦 企れ 企 一 讌 企 Balanced BST 譬襯( 2-3 BST, Red-Black BST) 碁Μ 覈 碁襷 殊所骸 るジ讓 觚碁Μ(sub tree) (height) 谿伎 蠏豺(Balance factor)襯 蠏豺螳 0覲企 覃 Left-heavy 觚碁Μ企, 0覲企 朱 Right-heavy 觚 碁Μ 碁螳 曙, (Rotation) 牛 蠏 蟲
8.
AVL 碁Μ 蠏豺(Balance factor)
9.
AVL 碁Μ 蟲
碁螳 曙, 蠏 蟾讌 曙 蠏 碁 蠏豺(Balance factor) 0 (zero) 曙 豺 襭(root) 碁蟾讌 path 覈 覿 覈(parent) 碁れ 蠏豺 レ 譴 覿蠏 襦 覲 碁 譴 螳 螳蟾 覿覈 碁 蠏 譟一(Rebalancing)
10.
蠏 蟾讌 蟆曙 蠏
曙 碁襯 N, 螳 螳蟾 覿蠏 覿覈 碁襯 A LL : N A 殊(L) 觚碁Μ 殊 朱 曙 LR : N A 殊 觚碁Μ るジ讓(R) 朱 曙 RR : N A るジ讓 觚碁Μ るジ讓 朱 曙 RL : N A るジ讓 觚碁Μ 殊 朱 曙
11.
蠏 譟一 覦覯 蠏
曙 碁襯 N, 螳 螳蟾 覿蠏 覿覈 碁襯 A LL : A覿 N蟾讌 蟆暑(Path) 碁れ るジ讓 (Rotation) LR : A覿 N蟾讌 蟆暑(Path) 碁れ 殊 - るジ讓 RR : A覿 N蟾讌 蟆暑(Path) 碁れ 殊 RL : A覿 N蟾讌 蟆暑(Path) 碁れ るジ讓 - 殊
12.
谿瑚 http://interactivepython.org/runestone/static/pythonds/Trees/Objectives.html
13.
螳矧.
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