Mercurial > hg > orthanc-stone
annotate OrthancStone/Resources/Graveyard/RTStructTentativeReimplementation-BGO/DisjointDataSet.h @ 2152:f68f9a8d0d63 dicom-sr tip
integration mainline->dicom-sr
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Sat, 31 Aug 2024 08:40:01 +0200 |
parents | 16c01cc201e7 |
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1 /** |
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2 * Stone of Orthanc |
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics |
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4 * Department, University Hospital of Liege, Belgium |
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5 * Copyright (C) 2017-2023 Osimis S.A., Belgium |
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6 * Copyright (C) 2021-2024 Sebastien Jodogne, ICTEAM UCLouvain, Belgium |
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7 * |
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8 * This program is free software: you can redistribute it and/or |
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9 * modify it under the terms of the GNU Lesser General Public License |
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10 * as published by the Free Software Foundation, either version 3 of |
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11 * the License, or (at your option) any later version. |
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12 * |
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13 * This program is distributed in the hope that it will be useful, but |
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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16 * Lesser General Public License for more details. |
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17 * |
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18 * You should have received a copy of the GNU Lesser General Public |
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19 * License along with this program. If not, see |
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20 * <http://www.gnu.org/licenses/>. |
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21 **/ |
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22 |
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23 #pragma once |
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24 |
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25 #include <vector> |
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26 |
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27 #include "../StoneException.h" |
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28 |
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29 namespace OrthancStone |
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30 { |
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31 class DisjointDataSet |
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32 { |
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33 public: |
1018 | 34 DisjointDataSet(size_t itemCount) : |
35 parents_(itemCount), | |
36 ranks_(itemCount) | |
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37 { |
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38 for (size_t index = 0; index < parents_.size(); index++) |
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39 { |
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40 SetParent(index,index); |
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41 ranks_[index] = 1; |
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42 } |
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43 } |
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44 |
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45 size_t Find(size_t item) |
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46 { |
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47 /* |
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48 If parents_[i] == i, it means i is representative of a set. |
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49 Otherwise, we go up the tree... |
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50 */ |
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51 if (GetParent(item) != item) |
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52 { |
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53 // if item is not a top item (representative of its set), |
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54 // we use path compression to improve future lookups |
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55 // see: https://en.wikipedia.org/wiki/Disjoint-set_data_structure#Path_compression |
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56 SetParent(item, Find(parents_[item])); |
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57 } |
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58 |
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59 // now that paths have been compressed, we are positively certain |
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60 // that item's parent is a set ("X is a set" means that X is the |
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61 // representative of a set) |
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62 return GetParent(item); |
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63 } |
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64 |
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65 /* |
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66 This merge the two sets that contains itemA and itemB |
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67 */ |
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68 void Union(size_t itemA, size_t itemB) |
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69 { |
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70 // Find current sets of x and y |
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71 size_t setA = Find(itemA); |
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72 size_t setB = Find(itemB); |
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73 |
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74 // if setA == setB, it means they are already in the same set and |
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75 // do not need to be merged! |
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76 if (setA != setB) |
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77 { |
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78 // we need to merge the sets, which means that the trees representing |
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79 // the sets needs to be merged (there must be a single top parent to |
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80 // all the items originally belonging to setA and setB must be the same) |
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81 |
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82 // since the algorithm speed is inversely proportional to the tree |
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83 // height (the rank), we need to combine trees in a way that |
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84 // minimizes this rank. See "Union by rank" at |
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85 // https://en.wikipedia.org/wiki/Disjoint-set_data_structure#by_rank |
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86 if (GetRank(setA) < GetRank(setB)) |
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87 { |
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88 SetParent(setA, setB); |
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89 } |
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90 else if (GetRank(setA) > GetRank(setB)) |
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91 { |
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92 SetParent(setB, setA); |
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93 } |
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94 else |
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95 { |
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96 SetParent(setB, setA); |
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97 BumpRank(setA); |
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98 // the trees had the same height but we attached the whole of setB |
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99 // under setA (under its parent), so the resulting tree is now |
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100 // 1 higher. setB is NOT representative of a set anymore. |
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101 } |
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102 } |
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103 } |
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104 |
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105 private: |
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106 size_t GetRank(size_t i) const |
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107 { |
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108 ORTHANC_ASSERT(i < ranks_.size()); |
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109 ORTHANC_ASSERT(ranks_.size() == parents_.size()); |
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110 return ranks_[i]; |
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111 } |
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112 |
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113 size_t GetParent(size_t i) const |
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114 { |
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115 ORTHANC_ASSERT(i < parents_.size()); |
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116 ORTHANC_ASSERT(ranks_.size() == parents_.size()); |
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117 return parents_[i]; |
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118 } |
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119 |
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120 void SetParent(size_t i, size_t parent) |
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121 { |
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122 ORTHANC_ASSERT(i < parents_.size()); |
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123 ORTHANC_ASSERT(ranks_.size() == parents_.size()); |
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124 parents_[i] = parent; |
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125 } |
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126 |
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127 void BumpRank(size_t i) |
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128 { |
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129 ORTHANC_ASSERT(i < ranks_.size()); |
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130 ORTHANC_ASSERT(ranks_.size() == parents_.size()); |
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131 ranks_[i] = ranks_[i] + 1u; |
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132 } |
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133 |
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134 /* |
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135 This vector contains the direct parent of each item |
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136 */ |
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137 std::vector<size_t> parents_; |
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138 |
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139 /* |
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140 This vector contains the tree height of each set. The values in the |
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141 vector for non-representative items is UNDEFINED! |
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142 */ |
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143 std::vector<size_t> ranks_; |
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144 }; |
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145 |
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146 } |