1 | #Region "Microsoft.VisualBasic::07da39e5070630eee10fd652e7ee005a, Microsoft.VisualBasic.Core\ComponentModel\Algorithm\BinaryTree\AVLSupports.vb" |
2 | |
3 | ' Author: |
4 | ' |
5 | ' asuka (amethyst.asuka@gcmodeller.org) |
6 | ' xie (genetics@smrucc.org) |
7 | ' xieguigang (xie.guigang@live.com) |
8 | ' |
9 | ' Copyright (c) 2018 GPL3 Licensed |
10 | ' |
11 | ' |
12 | ' GNU GENERAL PUBLIC LICENSE (GPL3) |
13 | ' |
14 | ' |
15 | ' This program is free software: you can redistribute it and/or modify |
16 | ' it under the terms of the GNU General Public License as published by |
17 | ' the Free Software Foundation, either version 3 of the License, or |
18 | ' (at your option) any later version. |
19 | ' |
20 | ' This program is distributed in the hope that it will be useful, |
21 | ' but WITHOUT ANY WARRANTY; without even the implied warranty of |
22 | ' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
23 | ' GNU General Public License for more details. |
24 | ' |
25 | ' You should have received a copy of the GNU General Public License |
26 | ' along with this program. If not, see <http://www.gnu.org/licenses/>. |
27 | |
28 | |
29 | |
30 | ' /********************************************************************************/ |
31 | |
32 | ' Summaries: |
33 | |
34 | ' Module AVLSupports |
35 | ' |
36 | ' Function: height, RotateLL, RotateLR, RotateRL, RotateRR |
37 | ' |
38 | ' Sub: PutHeight |
39 | ' |
40 | ' |
41 | ' /********************************************************************************/ |
42 | |
43 | #End Region |
44 | |
45 | Imports System.Runtime.CompilerServices |
46 | |
47 | Namespace ComponentModel.Algorithm.BinaryTree |
48 | |
49 | ''' <summary> |
50 | ''' Binary tree balance helper |
51 | ''' </summary> |
52 | Public Module AVLSupports |
53 | |
54 | <Extension> |
55 | Public Function RotateLL(Of K, V)(node As BinaryTree(Of K, V)) As BinaryTree(Of K, V) |
56 | Dim top = node.Left |
57 | |
58 | node.Left = top.Right |
59 | top.Right = node |
60 | |
61 | node.PutHeight |
62 | top.PutHeight |
63 | |
64 | Return top |
65 | End Function |
66 | |
67 | <Extension> |
68 | Public Function RotateRR(Of K, V)(node As BinaryTree(Of K, V)) As BinaryTree(Of K, V) |
69 | Dim top = node.Right |
70 | |
71 | node.Right = top.Left |
72 | top.Left = node |
73 | |
74 | Call node.PutHeight |
75 | Call top.PutHeight |
76 | |
77 | Return top |
78 | End Function |
79 | |
80 | <Extension> |
81 | Public Function RotateLR(Of K, V)(node As BinaryTree(Of K, V)) As BinaryTree(Of K, V) |
82 | node.Left = node.Left.RotateRR |
83 | Return node.RotateLL |
84 | End Function |
85 | |
86 | <Extension> |
87 | Public Function RotateRL(Of K, V)(node As BinaryTree(Of K, V)) As BinaryTree(Of K, V) |
88 | node.Right = node.Right.RotateLL |
89 | Return node.RotateRR |
90 | End Function |
91 | |
92 | <MethodImpl(MethodImplOptions.AggressiveInlining)> |
93 | <Extension> |
94 | Friend Function height(Of K, V)(node As BinaryTree(Of K, V)) As Double |
95 | Return If(node Is Nothing, -1, CDbl(node!height)) |
96 | End Function |
97 | |
98 | <MethodImpl(MethodImplOptions.AggressiveInlining)> |
99 | <Extension> |
100 | Friend Sub PutHeight(Of K, V)(node As BinaryTree(Of K, V)) |
101 | node.SetValue("height", Math.Max(node.Left.height, node.Right.height) + 1) |
102 | End Sub |
103 | End Module |
104 | End Namespace |