[948] | 1 | /* -*- C++ -*- |
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| 2 | * |
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[1956] | 3 | * This file is a part of LEMON, a generic C++ optimization library |
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| 4 | * |
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| 5 | * Copyright (C) 2003-2006 |
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| 6 | * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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[1359] | 7 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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[948] | 8 | * |
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| 9 | * Permission to use, modify and distribute this software is granted |
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| 10 | * provided that this copyright notice appears in all copies. For |
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| 11 | * precise terms see the accompanying LICENSE file. |
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| 12 | * |
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| 13 | * This software is provided "AS IS" with no warranty of any kind, |
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| 14 | * express or implied, and with no claim as to its suitability for any |
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| 15 | * purpose. |
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| 16 | * |
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| 17 | */ |
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[395] | 18 | |
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[921] | 19 | #ifndef LEMON_LIST_GRAPH_H |
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| 20 | #define LEMON_LIST_GRAPH_H |
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[395] | 21 | |
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[948] | 22 | ///\ingroup graphs |
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| 23 | ///\file |
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[2116] | 24 | ///\brief ListGraph, ListUGraph classes. |
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[948] | 25 | |
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[2116] | 26 | #include <lemon/bits/base_extender.h> |
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[1791] | 27 | #include <lemon/bits/graph_extender.h> |
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[782] | 28 | |
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[2116] | 29 | #include <lemon/error.h> |
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| 30 | |
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[1979] | 31 | #include <vector> |
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[1011] | 32 | #include <list> |
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[782] | 33 | |
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[921] | 34 | namespace lemon { |
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[395] | 35 | |
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[946] | 36 | class ListGraphBase { |
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[406] | 37 | |
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[949] | 38 | protected: |
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[946] | 39 | struct NodeT { |
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[1470] | 40 | int first_in, first_out; |
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[397] | 41 | int prev, next; |
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[395] | 42 | }; |
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[946] | 43 | |
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| 44 | struct EdgeT { |
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[986] | 45 | int target, source; |
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[397] | 46 | int prev_in, prev_out; |
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| 47 | int next_in, next_out; |
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[395] | 48 | }; |
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| 49 | |
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| 50 | std::vector<NodeT> nodes; |
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[946] | 51 | |
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[397] | 52 | int first_node; |
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[946] | 53 | |
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[397] | 54 | int first_free_node; |
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[946] | 55 | |
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[395] | 56 | std::vector<EdgeT> edges; |
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[946] | 57 | |
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[397] | 58 | int first_free_edge; |
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[395] | 59 | |
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[782] | 60 | public: |
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[395] | 61 | |
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[946] | 62 | typedef ListGraphBase Graph; |
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[397] | 63 | |
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[946] | 64 | class Node { |
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[975] | 65 | friend class ListGraphBase; |
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[946] | 66 | protected: |
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[395] | 67 | |
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[946] | 68 | int id; |
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[2031] | 69 | explicit Node(int pid) { id = pid;} |
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[395] | 70 | |
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[946] | 71 | public: |
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| 72 | Node() {} |
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| 73 | Node (Invalid) { id = -1; } |
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| 74 | bool operator==(const Node& node) const {return id == node.id;} |
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| 75 | bool operator!=(const Node& node) const {return id != node.id;} |
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| 76 | bool operator<(const Node& node) const {return id < node.id;} |
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| 77 | }; |
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[782] | 78 | |
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[946] | 79 | class Edge { |
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[975] | 80 | friend class ListGraphBase; |
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[946] | 81 | protected: |
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[782] | 82 | |
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[946] | 83 | int id; |
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[2031] | 84 | explicit Edge(int pid) { id = pid;} |
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[395] | 85 | |
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[946] | 86 | public: |
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| 87 | Edge() {} |
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| 88 | Edge (Invalid) { id = -1; } |
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| 89 | bool operator==(const Edge& edge) const {return id == edge.id;} |
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| 90 | bool operator!=(const Edge& edge) const {return id != edge.id;} |
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| 91 | bool operator<(const Edge& edge) const {return id < edge.id;} |
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| 92 | }; |
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| 93 | |
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| 94 | |
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| 95 | |
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| 96 | ListGraphBase() |
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[782] | 97 | : nodes(), first_node(-1), |
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| 98 | first_free_node(-1), edges(), first_free_edge(-1) {} |
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| 99 | |
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[395] | 100 | |
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[813] | 101 | /// Maximum node ID. |
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| 102 | |
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| 103 | /// Maximum node ID. |
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| 104 | ///\sa id(Node) |
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[1791] | 105 | int maxNodeId() const { return nodes.size()-1; } |
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[946] | 106 | |
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[813] | 107 | /// Maximum edge ID. |
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| 108 | |
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| 109 | /// Maximum edge ID. |
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| 110 | ///\sa id(Edge) |
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[1791] | 111 | int maxEdgeId() const { return edges.size()-1; } |
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[395] | 112 | |
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[2031] | 113 | Node source(Edge e) const { return Node(edges[e.id].source); } |
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| 114 | Node target(Edge e) const { return Node(edges[e.id].target); } |
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[395] | 115 | |
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| 116 | |
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[946] | 117 | void first(Node& node) const { |
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| 118 | node.id = first_node; |
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| 119 | } |
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| 120 | |
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| 121 | void next(Node& node) const { |
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| 122 | node.id = nodes[node.id].next; |
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| 123 | } |
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| 124 | |
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| 125 | |
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| 126 | void first(Edge& e) const { |
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| 127 | int n; |
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| 128 | for(n = first_node; |
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| 129 | n!=-1 && nodes[n].first_in == -1; |
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| 130 | n = nodes[n].next); |
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| 131 | e.id = (n == -1) ? -1 : nodes[n].first_in; |
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| 132 | } |
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| 133 | |
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| 134 | void next(Edge& edge) const { |
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| 135 | if (edges[edge.id].next_in != -1) { |
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| 136 | edge.id = edges[edge.id].next_in; |
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| 137 | } else { |
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| 138 | int n; |
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[986] | 139 | for(n = nodes[edges[edge.id].target].next; |
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[946] | 140 | n!=-1 && nodes[n].first_in == -1; |
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| 141 | n = nodes[n].next); |
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| 142 | edge.id = (n == -1) ? -1 : nodes[n].first_in; |
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| 143 | } |
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| 144 | } |
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| 145 | |
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| 146 | void firstOut(Edge &e, const Node& v) const { |
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| 147 | e.id = nodes[v.id].first_out; |
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| 148 | } |
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| 149 | void nextOut(Edge &e) const { |
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| 150 | e.id=edges[e.id].next_out; |
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| 151 | } |
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| 152 | |
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| 153 | void firstIn(Edge &e, const Node& v) const { |
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| 154 | e.id = nodes[v.id].first_in; |
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| 155 | } |
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| 156 | void nextIn(Edge &e) const { |
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| 157 | e.id=edges[e.id].next_in; |
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| 158 | } |
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| 159 | |
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[813] | 160 | |
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[946] | 161 | static int id(Node v) { return v.id; } |
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| 162 | static int id(Edge e) { return e.id; } |
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[395] | 163 | |
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[1791] | 164 | static Node nodeFromId(int id) { return Node(id);} |
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| 165 | static Edge edgeFromId(int id) { return Edge(id);} |
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[1106] | 166 | |
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[397] | 167 | /// Adds a new node to the graph. |
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| 168 | |
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[2123] | 169 | /// Adds a new node to the graph. |
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| 170 | /// |
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[813] | 171 | /// \warning It adds the new node to the front of the list. |
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[397] | 172 | /// (i.e. the lastly added node becomes the first.) |
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[946] | 173 | Node addNode() { |
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[397] | 174 | int n; |
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| 175 | |
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[946] | 176 | if(first_free_node==-1) { |
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| 177 | n = nodes.size(); |
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| 178 | nodes.push_back(NodeT()); |
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| 179 | } else { |
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[397] | 180 | n = first_free_node; |
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| 181 | first_free_node = nodes[n].next; |
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| 182 | } |
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| 183 | |
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| 184 | nodes[n].next = first_node; |
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| 185 | if(first_node != -1) nodes[first_node].prev = n; |
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| 186 | first_node = n; |
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| 187 | nodes[n].prev = -1; |
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| 188 | |
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| 189 | nodes[n].first_in = nodes[n].first_out = -1; |
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| 190 | |
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[946] | 191 | return Node(n); |
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[395] | 192 | } |
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| 193 | |
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| 194 | Edge addEdge(Node u, Node v) { |
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[946] | 195 | int n; |
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| 196 | |
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| 197 | if (first_free_edge == -1) { |
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| 198 | n = edges.size(); |
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| 199 | edges.push_back(EdgeT()); |
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| 200 | } else { |
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[397] | 201 | n = first_free_edge; |
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| 202 | first_free_edge = edges[n].next_in; |
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| 203 | } |
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| 204 | |
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[986] | 205 | edges[n].source = u.id; |
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| 206 | edges[n].target = v.id; |
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[395] | 207 | |
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[946] | 208 | edges[n].next_out = nodes[u.id].first_out; |
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| 209 | if(nodes[u.id].first_out != -1) { |
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| 210 | edges[nodes[u.id].first_out].prev_out = n; |
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| 211 | } |
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| 212 | |
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| 213 | edges[n].next_in = nodes[v.id].first_in; |
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| 214 | if(nodes[v.id].first_in != -1) { |
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| 215 | edges[nodes[v.id].first_in].prev_in = n; |
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| 216 | } |
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| 217 | |
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[397] | 218 | edges[n].prev_in = edges[n].prev_out = -1; |
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| 219 | |
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[946] | 220 | nodes[u.id].first_out = nodes[v.id].first_in = n; |
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[397] | 221 | |
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[946] | 222 | return Edge(n); |
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[395] | 223 | } |
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[774] | 224 | |
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[946] | 225 | void erase(const Node& node) { |
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| 226 | int n = node.id; |
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| 227 | |
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| 228 | if(nodes[n].next != -1) { |
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| 229 | nodes[nodes[n].next].prev = nodes[n].prev; |
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| 230 | } |
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| 231 | |
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| 232 | if(nodes[n].prev != -1) { |
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| 233 | nodes[nodes[n].prev].next = nodes[n].next; |
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| 234 | } else { |
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| 235 | first_node = nodes[n].next; |
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| 236 | } |
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| 237 | |
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| 238 | nodes[n].next = first_free_node; |
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| 239 | first_free_node = n; |
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[395] | 240 | |
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[774] | 241 | } |
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| 242 | |
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[946] | 243 | void erase(const Edge& edge) { |
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| 244 | int n = edge.id; |
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[397] | 245 | |
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[946] | 246 | if(edges[n].next_in!=-1) { |
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[397] | 247 | edges[edges[n].next_in].prev_in = edges[n].prev_in; |
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[946] | 248 | } |
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| 249 | |
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| 250 | if(edges[n].prev_in!=-1) { |
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[397] | 251 | edges[edges[n].prev_in].next_in = edges[n].next_in; |
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[946] | 252 | } else { |
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[986] | 253 | nodes[edges[n].target].first_in = edges[n].next_in; |
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[946] | 254 | } |
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| 255 | |
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[397] | 256 | |
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[946] | 257 | if(edges[n].next_out!=-1) { |
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[397] | 258 | edges[edges[n].next_out].prev_out = edges[n].prev_out; |
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[946] | 259 | } |
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| 260 | |
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| 261 | if(edges[n].prev_out!=-1) { |
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[397] | 262 | edges[edges[n].prev_out].next_out = edges[n].next_out; |
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[946] | 263 | } else { |
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[986] | 264 | nodes[edges[n].source].first_out = edges[n].next_out; |
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[946] | 265 | } |
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[397] | 266 | |
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| 267 | edges[n].next_in = first_free_edge; |
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[695] | 268 | first_free_edge = n; |
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[397] | 269 | |
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| 270 | } |
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| 271 | |
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| 272 | void clear() { |
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[782] | 273 | edges.clear(); |
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| 274 | nodes.clear(); |
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[946] | 275 | first_node = first_free_node = first_free_edge = -1; |
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[937] | 276 | } |
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| 277 | |
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[949] | 278 | protected: |
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[2111] | 279 | void changeTarget(Edge e, Node n) |
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[949] | 280 | { |
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| 281 | if(edges[e.id].next_in != -1) |
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| 282 | edges[edges[e.id].next_in].prev_in = edges[e.id].prev_in; |
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| 283 | if(edges[e.id].prev_in != -1) |
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| 284 | edges[edges[e.id].prev_in].next_in = edges[e.id].next_in; |
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[986] | 285 | else nodes[edges[e.id].target].first_in = edges[e.id].next_in; |
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[1702] | 286 | if (nodes[n.id].first_in != -1) { |
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| 287 | edges[nodes[n.id].first_in].prev_in = e.id; |
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| 288 | } |
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[986] | 289 | edges[e.id].target = n.id; |
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[949] | 290 | edges[e.id].prev_in = -1; |
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| 291 | edges[e.id].next_in = nodes[n.id].first_in; |
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| 292 | nodes[n.id].first_in = e.id; |
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| 293 | } |
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[2111] | 294 | void changeSource(Edge e, Node n) |
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[949] | 295 | { |
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| 296 | if(edges[e.id].next_out != -1) |
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| 297 | edges[edges[e.id].next_out].prev_out = edges[e.id].prev_out; |
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| 298 | if(edges[e.id].prev_out != -1) |
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| 299 | edges[edges[e.id].prev_out].next_out = edges[e.id].next_out; |
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[986] | 300 | else nodes[edges[e.id].source].first_out = edges[e.id].next_out; |
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[1702] | 301 | if (nodes[n.id].first_out != -1) { |
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| 302 | edges[nodes[n.id].first_out].prev_out = e.id; |
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| 303 | } |
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[986] | 304 | edges[e.id].source = n.id; |
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[949] | 305 | edges[e.id].prev_out = -1; |
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| 306 | edges[e.id].next_out = nodes[n.id].first_out; |
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| 307 | nodes[n.id].first_out = e.id; |
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| 308 | } |
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| 309 | |
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[919] | 310 | }; |
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[909] | 311 | |
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[1979] | 312 | typedef GraphExtender<ListGraphBase> ExtendedListGraphBase; |
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[400] | 313 | |
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[2116] | 314 | /// \addtogroup graphs |
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| 315 | /// @{ |
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[400] | 316 | |
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[948] | 317 | ///A list graph class. |
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[400] | 318 | |
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[2117] | 319 | ///This is a simple and fast graph implementation. |
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[948] | 320 | /// |
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[2117] | 321 | ///It conforms to the \ref concept::Graph "Graph concept" and it |
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[2111] | 322 | ///also provides several additional useful extra functionalities. |
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| 323 | ///The most of the member functions and nested classes are |
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| 324 | ///documented only in the concept class. |
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| 325 | ///\sa concept::Graph. |
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[782] | 326 | |
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[1999] | 327 | class ListGraph : public ExtendedListGraphBase { |
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[2128] | 328 | private: |
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| 329 | ///ListGraph is \e not copy constructible. Use GraphCopy() instead. |
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| 330 | |
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| 331 | ///ListGraph is \e not copy constructible. Use GraphCopy() instead. |
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| 332 | /// |
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| 333 | ListGraph(const ListGraph &) :ExtendedListGraphBase() {}; |
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[2132] | 334 | ///\brief Assignment of ListGraph to another one is \e not allowed. |
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[2128] | 335 | ///Use GraphCopy() instead. |
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| 336 | |
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[2132] | 337 | ///Assignment of ListGraph to another one is \e not allowed. |
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[2128] | 338 | ///Use GraphCopy() instead. |
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| 339 | void operator=(const ListGraph &) {} |
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[948] | 340 | public: |
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[1999] | 341 | |
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| 342 | typedef ExtendedListGraphBase Parent; |
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| 343 | |
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[2128] | 344 | /// Constructor |
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| 345 | |
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| 346 | /// Constructor. |
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| 347 | /// |
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| 348 | ListGraph() {} |
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| 349 | |
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[2111] | 350 | ///Add a new node to the graph. |
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| 351 | |
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| 352 | /// \return the new node. |
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| 353 | /// |
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| 354 | Node addNode() { return Parent::addNode(); } |
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| 355 | |
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| 356 | ///Add a new edge to the graph. |
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| 357 | |
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| 358 | ///Add a new edge to the graph with source node \c s |
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| 359 | ///and target node \c t. |
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| 360 | ///\return the new edge. |
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| 361 | Edge addEdge(const Node& s, const Node& t) { |
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| 362 | return Parent::addEdge(s, t); |
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| 363 | } |
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| 364 | |
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[1546] | 365 | /// Changes the target of \c e to \c n |
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[948] | 366 | |
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[1546] | 367 | /// Changes the target of \c e to \c n |
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[948] | 368 | /// |
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[2160] | 369 | ///\note The <tt>EdgeIt</tt>s and <tt>OutEdgeIt</tt>s referencing |
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[2114] | 370 | ///the changed edge remain valid. However <tt>InEdgeIt</tt>s are |
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| 371 | ///invalidated. |
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[2123] | 372 | ///\warning This functionality cannot be used together with the Snapshot |
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| 373 | ///feature. |
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[1718] | 374 | void changeTarget(Edge e, Node n) { |
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[2111] | 375 | Parent::changeTarget(e,n); |
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[1718] | 376 | } |
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[1546] | 377 | /// Changes the source of \c e to \c n |
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[948] | 378 | |
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[1546] | 379 | /// Changes the source of \c e to \c n |
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[948] | 380 | /// |
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[2160] | 381 | ///\note The <tt>EdgeIt</tt>s and <tt>InEdgeIt</tt>s referencing |
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[2114] | 382 | ///the changed edge remain valid. However <tt>OutEdgeIt</tt>s are |
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| 383 | ///invalidated. |
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[2123] | 384 | ///\warning This functionality cannot be used together with the Snapshot |
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| 385 | ///feature. |
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[1718] | 386 | void changeSource(Edge e, Node n) { |
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[2111] | 387 | Parent::changeSource(e,n); |
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[1718] | 388 | } |
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[949] | 389 | |
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[1010] | 390 | /// Invert the direction of an edge. |
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| 391 | |
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[2160] | 392 | ///\note The <tt>EdgeIt</tt>s referencing the changed edge remain |
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[2114] | 393 | ///valid. However <tt>OutEdgeIt</tt>s and <tt>InEdgeIt</tt>s are |
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| 394 | ///invalidated. |
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[2123] | 395 | ///\warning This functionality cannot be used together with the Snapshot |
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| 396 | ///feature. |
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[1010] | 397 | void reverseEdge(Edge e) { |
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| 398 | Node t=target(e); |
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[2111] | 399 | changeTarget(e,source(e)); |
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| 400 | changeSource(e,t); |
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[1010] | 401 | } |
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| 402 | |
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[2111] | 403 | /// \brief Using this it is possible to avoid the superfluous memory |
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| 404 | /// allocation. |
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[1010] | 405 | |
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[2107] | 406 | ///Using this it is possible to avoid the superfluous memory |
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| 407 | ///allocation: if you know that the graph you want to build will |
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[2123] | 408 | ///contain at least 10 million nodes then it is worth reserving |
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[2107] | 409 | ///space for this amount before starting to build the graph. |
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| 410 | void reserveNode(int n) { nodes.reserve(n); }; |
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| 411 | |
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[2111] | 412 | /// \brief Using this it is possible to avoid the superfluous memory |
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| 413 | /// allocation. |
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[2107] | 414 | |
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| 415 | ///Using this it is possible to avoid the superfluous memory |
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| 416 | ///allocation: see the \ref reserveNode function. |
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[949] | 417 | void reserveEdge(int n) { edges.reserve(n); }; |
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[1010] | 418 | |
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[2107] | 419 | |
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[1010] | 420 | ///Contract two nodes. |
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| 421 | |
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| 422 | ///This function contracts two nodes. |
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| 423 | /// |
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| 424 | ///Node \p b will be removed but instead of deleting |
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[2102] | 425 | ///incident edges, they will be joined to \p a. |
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[1010] | 426 | ///The last parameter \p r controls whether to remove loops. \c true |
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| 427 | ///means that loops will be removed. |
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| 428 | /// |
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[2160] | 429 | ///\note The <tt>EdgeIt</tt>s |
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[1281] | 430 | ///referencing a moved edge remain |
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[2160] | 431 | ///valid. However <tt>InEdgeIt</tt>s and <tt>OutEdgeIt</tt>s |
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[1010] | 432 | ///may be invalidated. |
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[2123] | 433 | ///\warning This functionality cannot be used together with the Snapshot |
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| 434 | ///feature. |
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[1718] | 435 | void contract(Node a, Node b, bool r = true) |
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[1010] | 436 | { |
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| 437 | for(OutEdgeIt e(*this,b);e!=INVALID;) { |
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| 438 | OutEdgeIt f=e; |
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| 439 | ++f; |
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| 440 | if(r && target(e)==a) erase(e); |
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[1546] | 441 | else changeSource(e,a); |
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[1010] | 442 | e=f; |
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| 443 | } |
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| 444 | for(InEdgeIt e(*this,b);e!=INVALID;) { |
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| 445 | InEdgeIt f=e; |
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| 446 | ++f; |
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| 447 | if(r && source(e)==a) erase(e); |
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[1546] | 448 | else changeTarget(e,a); |
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[1010] | 449 | e=f; |
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| 450 | } |
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| 451 | erase(b); |
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| 452 | } |
---|
[1011] | 453 | |
---|
[1281] | 454 | ///Split a node. |
---|
[1011] | 455 | |
---|
[1284] | 456 | ///This function splits a node. First a new node is added to the graph, |
---|
| 457 | ///then the source of each outgoing edge of \c n is moved to this new node. |
---|
[1281] | 458 | ///If \c connect is \c true (this is the default value), then a new edge |
---|
| 459 | ///from \c n to the newly created node is also added. |
---|
| 460 | ///\return The newly created node. |
---|
| 461 | /// |
---|
[2160] | 462 | ///\note The <tt>EdgeIt</tt>s referencing a moved edge remain |
---|
| 463 | ///valid. However <tt>InEdgeIt</tt>s and <tt>OutEdgeIt</tt>s may |
---|
| 464 | ///be invalidated. |
---|
| 465 | /// |
---|
| 466 | ///\warning This functionality cannot be used together with the |
---|
| 467 | ///Snapshot feature. \todo It could be implemented in a bit |
---|
| 468 | ///faster way. |
---|
[2114] | 469 | Node split(Node n, bool connect = true) { |
---|
[1281] | 470 | Node b = addNode(); |
---|
| 471 | for(OutEdgeIt e(*this,n);e!=INVALID;) { |
---|
| 472 | OutEdgeIt f=e; |
---|
| 473 | ++f; |
---|
[1546] | 474 | changeSource(e,b); |
---|
[1281] | 475 | e=f; |
---|
| 476 | } |
---|
[2114] | 477 | if (connect) addEdge(n,b); |
---|
[1281] | 478 | return b; |
---|
| 479 | } |
---|
| 480 | |
---|
[1812] | 481 | ///Split an edge. |
---|
| 482 | |
---|
[2102] | 483 | ///This function splits an edge. First a new node \c b is added to |
---|
| 484 | ///the graph, then the original edge is re-targeted to \c |
---|
| 485 | ///b. Finally an edge from \c b to the original target is added. |
---|
| 486 | ///\return The newly created node. |
---|
| 487 | ///\warning This functionality |
---|
| 488 | ///cannot be used together with the Snapshot feature. |
---|
[2114] | 489 | Node split(Edge e) { |
---|
[1812] | 490 | Node b = addNode(); |
---|
| 491 | addEdge(b,target(e)); |
---|
| 492 | changeTarget(e,b); |
---|
| 493 | return b; |
---|
| 494 | } |
---|
| 495 | |
---|
[2114] | 496 | /// \brief Class to make a snapshot of the graph and restore |
---|
| 497 | /// to it later. |
---|
[1011] | 498 | /// |
---|
[2114] | 499 | /// Class to make a snapshot of the graph and to restore it |
---|
| 500 | /// later. |
---|
[1011] | 501 | /// |
---|
[2114] | 502 | /// The newly added nodes and edges can be removed using the |
---|
| 503 | /// restore() function. |
---|
| 504 | /// |
---|
| 505 | /// \warning Edge and node deletions cannot be restored. |
---|
| 506 | class Snapshot { |
---|
[1774] | 507 | public: |
---|
| 508 | |
---|
| 509 | class UnsupportedOperation : public LogicError { |
---|
| 510 | public: |
---|
[2151] | 511 | virtual const char* what() const throw() { |
---|
[1774] | 512 | return "lemon::ListGraph::Snapshot::UnsupportedOperation"; |
---|
| 513 | } |
---|
| 514 | }; |
---|
| 515 | |
---|
| 516 | |
---|
[1999] | 517 | protected: |
---|
[2114] | 518 | |
---|
| 519 | typedef Parent::NodeNotifier NodeNotifier; |
---|
| 520 | |
---|
| 521 | class NodeObserverProxy : public NodeNotifier::ObserverBase { |
---|
| 522 | public: |
---|
| 523 | |
---|
| 524 | NodeObserverProxy(Snapshot& _snapshot) |
---|
| 525 | : snapshot(_snapshot) {} |
---|
| 526 | |
---|
| 527 | using NodeNotifier::ObserverBase::attach; |
---|
| 528 | using NodeNotifier::ObserverBase::detach; |
---|
| 529 | using NodeNotifier::ObserverBase::attached; |
---|
| 530 | |
---|
| 531 | protected: |
---|
| 532 | |
---|
| 533 | virtual void add(const Node& node) { |
---|
| 534 | snapshot.addNode(node); |
---|
| 535 | } |
---|
| 536 | virtual void add(const std::vector<Node>& nodes) { |
---|
| 537 | for (int i = nodes.size() - 1; i >= 0; ++i) { |
---|
| 538 | snapshot.addNode(nodes[i]); |
---|
| 539 | } |
---|
| 540 | } |
---|
| 541 | virtual void erase(const Node& node) { |
---|
| 542 | snapshot.eraseNode(node); |
---|
| 543 | } |
---|
| 544 | virtual void erase(const std::vector<Node>& nodes) { |
---|
| 545 | for (int i = 0; i < (int)nodes.size(); ++i) { |
---|
| 546 | if (!snapshot.eraseNode(nodes[i])) break; |
---|
| 547 | } |
---|
| 548 | } |
---|
| 549 | virtual void build() { |
---|
| 550 | NodeNotifier* notifier = getNotifier(); |
---|
| 551 | Node node; |
---|
| 552 | std::vector<Node> nodes; |
---|
| 553 | for (notifier->first(node); node != INVALID; notifier->next(node)) { |
---|
| 554 | nodes.push_back(node); |
---|
| 555 | } |
---|
| 556 | for (int i = nodes.size() - 1; i >= 0; --i) { |
---|
| 557 | snapshot.addNode(nodes[i]); |
---|
| 558 | } |
---|
| 559 | } |
---|
| 560 | virtual void clear() { |
---|
| 561 | NodeNotifier* notifier = getNotifier(); |
---|
| 562 | Node node; |
---|
| 563 | for (notifier->first(node); node != INVALID; notifier->next(node)) { |
---|
| 564 | if (!snapshot.eraseNode(node)) break; |
---|
| 565 | } |
---|
| 566 | } |
---|
| 567 | |
---|
| 568 | Snapshot& snapshot; |
---|
| 569 | }; |
---|
| 570 | |
---|
| 571 | class EdgeObserverProxy : public EdgeNotifier::ObserverBase { |
---|
| 572 | public: |
---|
| 573 | |
---|
| 574 | EdgeObserverProxy(Snapshot& _snapshot) |
---|
| 575 | : snapshot(_snapshot) {} |
---|
| 576 | |
---|
| 577 | using EdgeNotifier::ObserverBase::attach; |
---|
| 578 | using EdgeNotifier::ObserverBase::detach; |
---|
| 579 | using EdgeNotifier::ObserverBase::attached; |
---|
| 580 | |
---|
| 581 | protected: |
---|
| 582 | |
---|
| 583 | virtual void add(const Edge& edge) { |
---|
| 584 | snapshot.addEdge(edge); |
---|
| 585 | } |
---|
| 586 | virtual void add(const std::vector<Edge>& edges) { |
---|
| 587 | for (int i = edges.size() - 1; i >= 0; ++i) { |
---|
| 588 | snapshot.addEdge(edges[i]); |
---|
| 589 | } |
---|
| 590 | } |
---|
| 591 | virtual void erase(const Edge& edge) { |
---|
| 592 | snapshot.eraseEdge(edge); |
---|
| 593 | } |
---|
| 594 | virtual void erase(const std::vector<Edge>& edges) { |
---|
| 595 | for (int i = 0; i < (int)edges.size(); ++i) { |
---|
| 596 | if (!snapshot.eraseEdge(edges[i])) break; |
---|
| 597 | } |
---|
| 598 | } |
---|
| 599 | virtual void build() { |
---|
| 600 | EdgeNotifier* notifier = getNotifier(); |
---|
| 601 | Edge edge; |
---|
| 602 | std::vector<Edge> edges; |
---|
| 603 | for (notifier->first(edge); edge != INVALID; notifier->next(edge)) { |
---|
| 604 | edges.push_back(edge); |
---|
| 605 | } |
---|
| 606 | for (int i = edges.size() - 1; i >= 0; --i) { |
---|
| 607 | snapshot.addEdge(edges[i]); |
---|
| 608 | } |
---|
| 609 | } |
---|
| 610 | virtual void clear() { |
---|
| 611 | EdgeNotifier* notifier = getNotifier(); |
---|
| 612 | Edge edge; |
---|
| 613 | for (notifier->first(edge); edge != INVALID; notifier->next(edge)) { |
---|
| 614 | if (!snapshot.eraseEdge(edge)) break; |
---|
| 615 | } |
---|
| 616 | } |
---|
| 617 | |
---|
| 618 | Snapshot& snapshot; |
---|
| 619 | }; |
---|
[1011] | 620 | |
---|
[2114] | 621 | ListGraph *graph; |
---|
| 622 | |
---|
| 623 | NodeObserverProxy node_observer_proxy; |
---|
| 624 | EdgeObserverProxy edge_observer_proxy; |
---|
| 625 | |
---|
[1011] | 626 | std::list<Node> added_nodes; |
---|
| 627 | std::list<Edge> added_edges; |
---|
[2114] | 628 | |
---|
| 629 | |
---|
| 630 | void addNode(const Node& node) { |
---|
| 631 | added_nodes.push_front(node); |
---|
[1011] | 632 | } |
---|
[2114] | 633 | bool eraseNode(const Node& node) { |
---|
| 634 | std::list<Node>::iterator it = |
---|
| 635 | std::find(added_nodes.begin(), added_nodes.end(), node); |
---|
| 636 | if (it == added_nodes.end()) { |
---|
| 637 | clear(); |
---|
| 638 | return false; |
---|
| 639 | } else { |
---|
| 640 | added_nodes.erase(it); |
---|
| 641 | return true; |
---|
| 642 | } |
---|
[1011] | 643 | } |
---|
| 644 | |
---|
[2114] | 645 | void addEdge(const Edge& edge) { |
---|
| 646 | added_edges.push_front(edge); |
---|
| 647 | } |
---|
| 648 | bool eraseEdge(const Edge& edge) { |
---|
| 649 | std::list<Edge>::iterator it = |
---|
| 650 | std::find(added_edges.begin(), added_edges.end(), edge); |
---|
| 651 | if (it == added_edges.end()) { |
---|
| 652 | clear(); |
---|
| 653 | return false; |
---|
| 654 | } else { |
---|
| 655 | added_edges.erase(it); |
---|
| 656 | return true; |
---|
| 657 | } |
---|
| 658 | } |
---|
[1457] | 659 | |
---|
[2114] | 660 | void attach(ListGraph &_graph) { |
---|
| 661 | graph = &_graph; |
---|
| 662 | node_observer_proxy.attach(graph->getNotifier(Node())); |
---|
| 663 | edge_observer_proxy.attach(graph->getNotifier(Edge())); |
---|
[1011] | 664 | } |
---|
| 665 | |
---|
[2114] | 666 | void detach() { |
---|
| 667 | node_observer_proxy.detach(); |
---|
| 668 | edge_observer_proxy.detach(); |
---|
| 669 | } |
---|
| 670 | |
---|
| 671 | void clear() { |
---|
| 672 | detach(); |
---|
| 673 | added_nodes.clear(); |
---|
| 674 | added_edges.clear(); |
---|
[1011] | 675 | } |
---|
[1774] | 676 | |
---|
[1011] | 677 | public: |
---|
[2114] | 678 | |
---|
[2160] | 679 | /// \brief Default constructor. |
---|
[2114] | 680 | /// |
---|
| 681 | /// Default constructor. |
---|
| 682 | /// To actually make a snapshot you must call save(). |
---|
| 683 | Snapshot() |
---|
| 684 | : graph(0), node_observer_proxy(*this), |
---|
| 685 | edge_observer_proxy(*this) {} |
---|
[1011] | 686 | |
---|
[2114] | 687 | /// \brief Constructor that immediately makes a snapshot. |
---|
| 688 | /// |
---|
| 689 | /// This constructor immediately makes a snapshot of the graph. |
---|
| 690 | /// \param _graph The graph we make a snapshot of. |
---|
| 691 | Snapshot(ListGraph &_graph) |
---|
| 692 | : node_observer_proxy(*this), |
---|
| 693 | edge_observer_proxy(*this) { |
---|
| 694 | attach(_graph); |
---|
[1011] | 695 | } |
---|
| 696 | |
---|
[2114] | 697 | /// \brief Make a snapshot. |
---|
[1011] | 698 | /// |
---|
[2114] | 699 | /// Make a snapshot of the graph. |
---|
| 700 | /// |
---|
| 701 | /// This function can be called more than once. In case of a repeated |
---|
| 702 | /// call, the previous snapshot gets lost. |
---|
| 703 | /// \param _graph The graph we make the snapshot of. |
---|
| 704 | void save(ListGraph &_graph) { |
---|
| 705 | clear(); |
---|
| 706 | attach(_graph); |
---|
[1011] | 707 | } |
---|
| 708 | |
---|
[2114] | 709 | /// \brief Undo the changes until the last snapshot. |
---|
| 710 | // |
---|
[2123] | 711 | /// Undo the changes until the last snapshot created by save(). |
---|
[1011] | 712 | void restore() { |
---|
[2114] | 713 | detach(); |
---|
[1011] | 714 | while(!added_edges.empty()) { |
---|
[2114] | 715 | graph->erase(added_edges.front()); |
---|
[1011] | 716 | added_edges.pop_front(); |
---|
| 717 | } |
---|
| 718 | while(!added_nodes.empty()) { |
---|
[2114] | 719 | graph->erase(added_nodes.front()); |
---|
[1011] | 720 | added_nodes.pop_front(); |
---|
| 721 | } |
---|
| 722 | } |
---|
[2114] | 723 | |
---|
| 724 | /// \brief Gives back true when the snapshot is valid. |
---|
| 725 | /// |
---|
| 726 | /// Gives back true when the snapshot is valid. |
---|
| 727 | bool valid() const { |
---|
| 728 | return node_observer_proxy.attached(); |
---|
| 729 | } |
---|
[1011] | 730 | }; |
---|
| 731 | |
---|
[949] | 732 | }; |
---|
[1034] | 733 | |
---|
[2116] | 734 | ///@} |
---|
| 735 | |
---|
| 736 | /**************** Undirected List Graph ****************/ |
---|
| 737 | |
---|
| 738 | typedef UGraphExtender<UndirGraphExtender<ListGraphBase> > |
---|
| 739 | ExtendedListUGraphBase; |
---|
| 740 | |
---|
| 741 | /// \addtogroup graphs |
---|
| 742 | /// @{ |
---|
| 743 | |
---|
| 744 | ///An undirected list graph class. |
---|
| 745 | |
---|
[2117] | 746 | ///This is a simple and fast undirected graph implementation. |
---|
[2116] | 747 | /// |
---|
| 748 | ///It conforms to the |
---|
[2117] | 749 | ///\ref concept::UGraph "UGraph concept". |
---|
[2116] | 750 | /// |
---|
| 751 | ///\sa concept::UGraph. |
---|
| 752 | /// |
---|
| 753 | class ListUGraph : public ExtendedListUGraphBase { |
---|
[2128] | 754 | private: |
---|
| 755 | ///ListUGraph is \e not copy constructible. Use UGraphCopy() instead. |
---|
| 756 | |
---|
| 757 | ///ListUGraph is \e not copy constructible. Use UGraphCopy() instead. |
---|
| 758 | /// |
---|
| 759 | ListUGraph(const ListUGraph &) :ExtendedListUGraphBase() {}; |
---|
[2132] | 760 | ///\brief Assignment of ListUGraph to another one is \e not allowed. |
---|
[2128] | 761 | ///Use UGraphCopy() instead. |
---|
| 762 | |
---|
[2132] | 763 | ///Assignment of ListUGraph to another one is \e not allowed. |
---|
[2128] | 764 | ///Use UGraphCopy() instead. |
---|
| 765 | void operator=(const ListUGraph &) {} |
---|
[2116] | 766 | public: |
---|
[2128] | 767 | /// Constructor |
---|
| 768 | |
---|
| 769 | /// Constructor. |
---|
| 770 | /// |
---|
| 771 | ListUGraph() {} |
---|
| 772 | |
---|
[2116] | 773 | typedef ExtendedListUGraphBase Parent; |
---|
| 774 | /// \brief Add a new node to the graph. |
---|
| 775 | /// |
---|
| 776 | /// \return the new node. |
---|
| 777 | /// |
---|
| 778 | Node addNode() { return Parent::addNode(); } |
---|
| 779 | |
---|
| 780 | /// \brief Add a new edge to the graph. |
---|
| 781 | /// |
---|
| 782 | /// Add a new edge to the graph with source node \c s |
---|
| 783 | /// and target node \c t. |
---|
| 784 | /// \return the new undirected edge. |
---|
| 785 | UEdge addEdge(const Node& s, const Node& t) { |
---|
| 786 | return Parent::addEdge(s, t); |
---|
| 787 | } |
---|
[2160] | 788 | /// \brief Changes the source of \c e to \c n |
---|
| 789 | /// |
---|
| 790 | /// Changes the source of \c e to \c n |
---|
| 791 | /// |
---|
| 792 | ///\note The <tt>EdgeIt</tt>s and <tt>InEdgeIt</tt>s |
---|
| 793 | ///referencing the changed edge remain |
---|
| 794 | ///valid. However <tt>OutEdgeIt</tt>s are invalidated. |
---|
| 795 | void changeSource(UEdge e, Node n) { |
---|
| 796 | Parent::changeSource(e,n); |
---|
| 797 | } |
---|
[2116] | 798 | /// \brief Changes the target of \c e to \c n |
---|
| 799 | /// |
---|
| 800 | /// Changes the target of \c e to \c n |
---|
| 801 | /// |
---|
[2160] | 802 | /// \note The <tt>EdgeIt</tt>s referencing the changed edge remain |
---|
| 803 | /// valid. However the other iterators may be invalidated. |
---|
[2116] | 804 | void changeTarget(UEdge e, Node n) { |
---|
| 805 | Parent::changeTarget(e,n); |
---|
| 806 | } |
---|
[2160] | 807 | /// \brief Changes the source of \c e to \c n |
---|
[2116] | 808 | /// |
---|
[2160] | 809 | /// Changes the source of \c e to \c n. It changes the proper |
---|
| 810 | /// node of the represented undirected edge. |
---|
[2116] | 811 | /// |
---|
[2160] | 812 | ///\note The <tt>EdgeIt</tt>s and <tt>InEdgeIt</tt>s |
---|
[2116] | 813 | ///referencing the changed edge remain |
---|
[2160] | 814 | ///valid. However <tt>OutEdgeIt</tt>s are invalidated. |
---|
| 815 | void changeSource(Edge e, Node n) { |
---|
| 816 | if (Parent::direction(e)) { |
---|
| 817 | Parent::changeSource(e,n); |
---|
| 818 | } else { |
---|
| 819 | Parent::changeTarget(e,n); |
---|
| 820 | } |
---|
| 821 | } |
---|
| 822 | /// \brief Changes the target of \c e to \c n |
---|
| 823 | /// |
---|
| 824 | /// Changes the target of \c e to \c n. It changes the proper |
---|
| 825 | /// node of the represented undirected edge. |
---|
| 826 | /// |
---|
| 827 | ///\note The <tt>EdgeIt</tt>s and <tt>OutEdgeIt</tt>s |
---|
| 828 | ///referencing the changed edge remain |
---|
| 829 | ///valid. However <tt>InEdgeIt</tt>s are invalidated. |
---|
| 830 | void changeTarget(Edge e, Node n) { |
---|
| 831 | if (Parent::direction(e)) { |
---|
| 832 | Parent::changeTarget(e,n); |
---|
| 833 | } else { |
---|
| 834 | Parent::changeSource(e,n); |
---|
| 835 | } |
---|
[2116] | 836 | } |
---|
| 837 | /// \brief Contract two nodes. |
---|
| 838 | /// |
---|
| 839 | /// This function contracts two nodes. |
---|
| 840 | /// |
---|
| 841 | /// Node \p b will be removed but instead of deleting |
---|
| 842 | /// its neighboring edges, they will be joined to \p a. |
---|
| 843 | /// The last parameter \p r controls whether to remove loops. \c true |
---|
| 844 | /// means that loops will be removed. |
---|
| 845 | /// |
---|
[2160] | 846 | /// \note The <tt>EdgeIt</tt>s referencing a moved edge remain |
---|
[2116] | 847 | /// valid. |
---|
| 848 | void contract(Node a, Node b, bool r = true) { |
---|
| 849 | for(IncEdgeIt e(*this, b); e!=INVALID;) { |
---|
| 850 | IncEdgeIt f = e; ++f; |
---|
| 851 | if (r && runningNode(e) == a) { |
---|
| 852 | erase(e); |
---|
| 853 | } else if (source(e) == b) { |
---|
| 854 | changeSource(e, a); |
---|
| 855 | } else { |
---|
| 856 | changeTarget(e, a); |
---|
| 857 | } |
---|
| 858 | e = f; |
---|
| 859 | } |
---|
| 860 | erase(b); |
---|
| 861 | } |
---|
| 862 | }; |
---|
| 863 | |
---|
| 864 | |
---|
| 865 | class ListBpUGraphBase { |
---|
| 866 | public: |
---|
| 867 | |
---|
| 868 | class NodeSetError : public LogicError { |
---|
[2160] | 869 | public: |
---|
[2151] | 870 | virtual const char* what() const throw() { |
---|
[2116] | 871 | return "lemon::ListBpUGraph::NodeSetError"; |
---|
| 872 | } |
---|
| 873 | }; |
---|
| 874 | |
---|
| 875 | protected: |
---|
| 876 | |
---|
| 877 | struct NodeT { |
---|
| 878 | int first_edge, prev, next; |
---|
| 879 | }; |
---|
| 880 | |
---|
| 881 | struct UEdgeT { |
---|
| 882 | int aNode, prev_out, next_out; |
---|
| 883 | int bNode, prev_in, next_in; |
---|
| 884 | }; |
---|
| 885 | |
---|
| 886 | std::vector<NodeT> aNodes; |
---|
| 887 | std::vector<NodeT> bNodes; |
---|
| 888 | |
---|
| 889 | std::vector<UEdgeT> edges; |
---|
| 890 | |
---|
| 891 | int first_anode; |
---|
| 892 | int first_free_anode; |
---|
| 893 | |
---|
| 894 | int first_bnode; |
---|
| 895 | int first_free_bnode; |
---|
| 896 | |
---|
| 897 | int first_free_edge; |
---|
| 898 | |
---|
| 899 | public: |
---|
| 900 | |
---|
| 901 | class Node { |
---|
| 902 | friend class ListBpUGraphBase; |
---|
| 903 | protected: |
---|
| 904 | int id; |
---|
| 905 | |
---|
| 906 | explicit Node(int _id) : id(_id) {} |
---|
| 907 | public: |
---|
| 908 | Node() {} |
---|
| 909 | Node(Invalid) { id = -1; } |
---|
| 910 | bool operator==(const Node i) const {return id==i.id;} |
---|
| 911 | bool operator!=(const Node i) const {return id!=i.id;} |
---|
| 912 | bool operator<(const Node i) const {return id<i.id;} |
---|
| 913 | }; |
---|
| 914 | |
---|
| 915 | class UEdge { |
---|
| 916 | friend class ListBpUGraphBase; |
---|
| 917 | protected: |
---|
| 918 | int id; |
---|
| 919 | |
---|
| 920 | explicit UEdge(int _id) { id = _id;} |
---|
| 921 | public: |
---|
| 922 | UEdge() {} |
---|
| 923 | UEdge (Invalid) { id = -1; } |
---|
| 924 | bool operator==(const UEdge i) const {return id==i.id;} |
---|
| 925 | bool operator!=(const UEdge i) const {return id!=i.id;} |
---|
| 926 | bool operator<(const UEdge i) const {return id<i.id;} |
---|
| 927 | }; |
---|
| 928 | |
---|
| 929 | ListBpUGraphBase() |
---|
| 930 | : first_anode(-1), first_free_anode(-1), |
---|
| 931 | first_bnode(-1), first_free_bnode(-1), |
---|
| 932 | first_free_edge(-1) {} |
---|
| 933 | |
---|
| 934 | void firstANode(Node& node) const { |
---|
| 935 | node.id = first_anode != -1 ? (first_anode << 1) : -1; |
---|
| 936 | } |
---|
| 937 | void nextANode(Node& node) const { |
---|
| 938 | node.id = aNodes[node.id >> 1].next; |
---|
| 939 | } |
---|
| 940 | |
---|
| 941 | void firstBNode(Node& node) const { |
---|
| 942 | node.id = first_bnode != -1 ? (first_bnode << 1) + 1 : -1; |
---|
| 943 | } |
---|
| 944 | void nextBNode(Node& node) const { |
---|
| 945 | node.id = bNodes[node.id >> 1].next; |
---|
| 946 | } |
---|
| 947 | |
---|
| 948 | void first(Node& node) const { |
---|
| 949 | if (first_anode != -1) { |
---|
| 950 | node.id = (first_anode << 1); |
---|
| 951 | } else if (first_bnode != -1) { |
---|
| 952 | node.id = (first_bnode << 1) + 1; |
---|
| 953 | } else { |
---|
| 954 | node.id = -1; |
---|
| 955 | } |
---|
| 956 | } |
---|
| 957 | void next(Node& node) const { |
---|
| 958 | if (aNode(node)) { |
---|
| 959 | node.id = aNodes[node.id >> 1].next; |
---|
| 960 | if (node.id == -1) { |
---|
| 961 | if (first_bnode != -1) { |
---|
| 962 | node.id = (first_bnode << 1) + 1; |
---|
| 963 | } |
---|
| 964 | } |
---|
| 965 | } else { |
---|
| 966 | node.id = bNodes[node.id >> 1].next; |
---|
| 967 | } |
---|
| 968 | } |
---|
| 969 | |
---|
| 970 | void first(UEdge& edge) const { |
---|
| 971 | int aNodeId = first_anode; |
---|
| 972 | while (aNodeId != -1 && aNodes[aNodeId].first_edge == -1) { |
---|
| 973 | aNodeId = aNodes[aNodeId].next != -1 ? |
---|
| 974 | aNodes[aNodeId].next >> 1 : -1; |
---|
| 975 | } |
---|
| 976 | if (aNodeId != -1) { |
---|
| 977 | edge.id = aNodes[aNodeId].first_edge; |
---|
| 978 | } else { |
---|
| 979 | edge.id = -1; |
---|
| 980 | } |
---|
| 981 | } |
---|
| 982 | void next(UEdge& edge) const { |
---|
| 983 | int aNodeId = edges[edge.id].aNode >> 1; |
---|
| 984 | edge.id = edges[edge.id].next_out; |
---|
| 985 | if (edge.id == -1) { |
---|
| 986 | aNodeId = aNodes[aNodeId].next != -1 ? |
---|
| 987 | aNodes[aNodeId].next >> 1 : -1; |
---|
| 988 | while (aNodeId != -1 && aNodes[aNodeId].first_edge == -1) { |
---|
| 989 | aNodeId = aNodes[aNodeId].next != -1 ? |
---|
| 990 | aNodes[aNodeId].next >> 1 : -1; |
---|
| 991 | } |
---|
| 992 | if (aNodeId != -1) { |
---|
| 993 | edge.id = aNodes[aNodeId].first_edge; |
---|
| 994 | } else { |
---|
| 995 | edge.id = -1; |
---|
| 996 | } |
---|
| 997 | } |
---|
| 998 | } |
---|
| 999 | |
---|
| 1000 | void firstFromANode(UEdge& edge, const Node& node) const { |
---|
| 1001 | LEMON_ASSERT((node.id & 1) == 0, NodeSetError()); |
---|
| 1002 | edge.id = aNodes[node.id >> 1].first_edge; |
---|
| 1003 | } |
---|
| 1004 | void nextFromANode(UEdge& edge) const { |
---|
| 1005 | edge.id = edges[edge.id].next_out; |
---|
| 1006 | } |
---|
| 1007 | |
---|
| 1008 | void firstFromBNode(UEdge& edge, const Node& node) const { |
---|
| 1009 | LEMON_ASSERT((node.id & 1) == 1, NodeSetError()); |
---|
| 1010 | edge.id = bNodes[node.id >> 1].first_edge; |
---|
| 1011 | } |
---|
| 1012 | void nextFromBNode(UEdge& edge) const { |
---|
| 1013 | edge.id = edges[edge.id].next_in; |
---|
| 1014 | } |
---|
| 1015 | |
---|
| 1016 | static int id(const Node& node) { |
---|
| 1017 | return node.id; |
---|
| 1018 | } |
---|
| 1019 | static Node nodeFromId(int id) { |
---|
| 1020 | return Node(id); |
---|
| 1021 | } |
---|
| 1022 | int maxNodeId() const { |
---|
| 1023 | return aNodes.size() > bNodes.size() ? |
---|
| 1024 | aNodes.size() * 2 - 2 : bNodes.size() * 2 - 1; |
---|
| 1025 | } |
---|
| 1026 | |
---|
| 1027 | static int id(const UEdge& edge) { |
---|
| 1028 | return edge.id; |
---|
| 1029 | } |
---|
| 1030 | static UEdge uEdgeFromId(int id) { |
---|
| 1031 | return UEdge(id); |
---|
| 1032 | } |
---|
| 1033 | int maxUEdgeId() const { |
---|
| 1034 | return edges.size(); |
---|
| 1035 | } |
---|
| 1036 | |
---|
| 1037 | static int aNodeId(const Node& node) { |
---|
| 1038 | return node.id >> 1; |
---|
| 1039 | } |
---|
| 1040 | static Node fromANodeId(int id) { |
---|
| 1041 | return Node(id << 1); |
---|
| 1042 | } |
---|
| 1043 | int maxANodeId() const { |
---|
| 1044 | return aNodes.size(); |
---|
| 1045 | } |
---|
| 1046 | |
---|
| 1047 | static int bNodeId(const Node& node) { |
---|
| 1048 | return node.id >> 1; |
---|
| 1049 | } |
---|
| 1050 | static Node fromBNodeId(int id) { |
---|
| 1051 | return Node((id << 1) + 1); |
---|
| 1052 | } |
---|
| 1053 | int maxBNodeId() const { |
---|
| 1054 | return bNodes.size(); |
---|
| 1055 | } |
---|
| 1056 | |
---|
| 1057 | Node aNode(const UEdge& edge) const { |
---|
| 1058 | return Node(edges[edge.id].aNode); |
---|
| 1059 | } |
---|
| 1060 | Node bNode(const UEdge& edge) const { |
---|
| 1061 | return Node(edges[edge.id].bNode); |
---|
| 1062 | } |
---|
| 1063 | |
---|
| 1064 | static bool aNode(const Node& node) { |
---|
| 1065 | return (node.id & 1) == 0; |
---|
| 1066 | } |
---|
| 1067 | |
---|
| 1068 | static bool bNode(const Node& node) { |
---|
| 1069 | return (node.id & 1) == 1; |
---|
| 1070 | } |
---|
| 1071 | |
---|
| 1072 | Node addANode() { |
---|
| 1073 | int aNodeId; |
---|
| 1074 | if (first_free_anode == -1) { |
---|
| 1075 | aNodeId = aNodes.size(); |
---|
| 1076 | aNodes.push_back(NodeT()); |
---|
| 1077 | } else { |
---|
| 1078 | aNodeId = first_free_anode; |
---|
| 1079 | first_free_anode = aNodes[first_free_anode].next; |
---|
| 1080 | } |
---|
| 1081 | if (first_anode != -1) { |
---|
| 1082 | aNodes[aNodeId].next = first_anode << 1; |
---|
| 1083 | aNodes[first_anode].prev = aNodeId << 1; |
---|
| 1084 | } else { |
---|
| 1085 | aNodes[aNodeId].next = -1; |
---|
| 1086 | } |
---|
| 1087 | aNodes[aNodeId].prev = -1; |
---|
| 1088 | first_anode = aNodeId; |
---|
| 1089 | aNodes[aNodeId].first_edge = -1; |
---|
| 1090 | return Node(aNodeId << 1); |
---|
| 1091 | } |
---|
| 1092 | |
---|
| 1093 | Node addBNode() { |
---|
| 1094 | int bNodeId; |
---|
| 1095 | if (first_free_bnode == -1) { |
---|
| 1096 | bNodeId = bNodes.size(); |
---|
| 1097 | bNodes.push_back(NodeT()); |
---|
| 1098 | } else { |
---|
| 1099 | bNodeId = first_free_bnode; |
---|
| 1100 | first_free_bnode = bNodes[first_free_bnode].next; |
---|
| 1101 | } |
---|
| 1102 | if (first_bnode != -1) { |
---|
| 1103 | bNodes[bNodeId].next = (first_bnode << 1) + 1; |
---|
| 1104 | bNodes[first_bnode].prev = (bNodeId << 1) + 1; |
---|
| 1105 | } else { |
---|
| 1106 | bNodes[bNodeId].next = -1; |
---|
| 1107 | } |
---|
| 1108 | first_bnode = bNodeId; |
---|
| 1109 | bNodes[bNodeId].first_edge = -1; |
---|
| 1110 | return Node((bNodeId << 1) + 1); |
---|
| 1111 | } |
---|
| 1112 | |
---|
| 1113 | UEdge addEdge(const Node& source, const Node& target) { |
---|
| 1114 | LEMON_ASSERT(((source.id ^ target.id) & 1) == 1, NodeSetError()); |
---|
| 1115 | int edgeId; |
---|
| 1116 | if (first_free_edge != -1) { |
---|
| 1117 | edgeId = first_free_edge; |
---|
| 1118 | first_free_edge = edges[edgeId].next_out; |
---|
| 1119 | } else { |
---|
| 1120 | edgeId = edges.size(); |
---|
| 1121 | edges.push_back(UEdgeT()); |
---|
| 1122 | } |
---|
| 1123 | if ((source.id & 1) == 0) { |
---|
| 1124 | edges[edgeId].aNode = source.id; |
---|
| 1125 | edges[edgeId].bNode = target.id; |
---|
| 1126 | } else { |
---|
| 1127 | edges[edgeId].aNode = target.id; |
---|
| 1128 | edges[edgeId].bNode = source.id; |
---|
| 1129 | } |
---|
| 1130 | edges[edgeId].next_out = aNodes[edges[edgeId].aNode >> 1].first_edge; |
---|
| 1131 | edges[edgeId].prev_out = -1; |
---|
| 1132 | if (aNodes[edges[edgeId].aNode >> 1].first_edge != -1) { |
---|
| 1133 | edges[aNodes[edges[edgeId].aNode >> 1].first_edge].prev_out = edgeId; |
---|
| 1134 | } |
---|
| 1135 | aNodes[edges[edgeId].aNode >> 1].first_edge = edgeId; |
---|
| 1136 | edges[edgeId].next_in = bNodes[edges[edgeId].bNode >> 1].first_edge; |
---|
| 1137 | edges[edgeId].prev_in = -1; |
---|
| 1138 | if (bNodes[edges[edgeId].bNode >> 1].first_edge != -1) { |
---|
| 1139 | edges[bNodes[edges[edgeId].bNode >> 1].first_edge].prev_in = edgeId; |
---|
| 1140 | } |
---|
| 1141 | bNodes[edges[edgeId].bNode >> 1].first_edge = edgeId; |
---|
| 1142 | return UEdge(edgeId); |
---|
| 1143 | } |
---|
| 1144 | |
---|
| 1145 | void erase(const Node& node) { |
---|
| 1146 | if (aNode(node)) { |
---|
| 1147 | int aNodeId = node.id >> 1; |
---|
| 1148 | if (aNodes[aNodeId].prev != -1) { |
---|
| 1149 | aNodes[aNodes[aNodeId].prev >> 1].next = aNodes[aNodeId].next; |
---|
| 1150 | } else { |
---|
| 1151 | first_anode = aNodes[aNodeId].next >> 1; |
---|
| 1152 | } |
---|
| 1153 | if (aNodes[aNodeId].next != -1) { |
---|
| 1154 | aNodes[aNodes[aNodeId].next >> 1].prev = aNodes[aNodeId].prev; |
---|
| 1155 | } |
---|
| 1156 | aNodes[aNodeId].next = first_free_anode; |
---|
| 1157 | first_free_anode = aNodeId; |
---|
| 1158 | } else { |
---|
| 1159 | int bNodeId = node.id >> 1; |
---|
| 1160 | if (bNodes[bNodeId].prev != -1) { |
---|
| 1161 | bNodes[bNodes[bNodeId].prev >> 1].next = bNodes[bNodeId].next; |
---|
| 1162 | } else { |
---|
| 1163 | first_bnode = bNodes[bNodeId].next >> 1; |
---|
| 1164 | } |
---|
| 1165 | if (bNodes[bNodeId].next != -1) { |
---|
| 1166 | bNodes[bNodes[bNodeId].next >> 1].prev = bNodes[bNodeId].prev; |
---|
| 1167 | } |
---|
| 1168 | bNodes[bNodeId].next = first_free_bnode; |
---|
| 1169 | first_free_bnode = bNodeId; |
---|
| 1170 | } |
---|
| 1171 | } |
---|
| 1172 | |
---|
| 1173 | void erase(const UEdge& edge) { |
---|
| 1174 | |
---|
| 1175 | if (edges[edge.id].prev_out != -1) { |
---|
| 1176 | edges[edges[edge.id].prev_out].next_out = edges[edge.id].next_out; |
---|
| 1177 | } else { |
---|
| 1178 | aNodes[edges[edge.id].aNode >> 1].first_edge = edges[edge.id].next_out; |
---|
| 1179 | } |
---|
| 1180 | if (edges[edge.id].next_out != -1) { |
---|
| 1181 | edges[edges[edge.id].next_out].prev_out = edges[edge.id].prev_out; |
---|
| 1182 | } |
---|
| 1183 | |
---|
| 1184 | if (edges[edge.id].prev_in != -1) { |
---|
| 1185 | edges[edges[edge.id].prev_in].next_in = edges[edge.id].next_in; |
---|
| 1186 | } else { |
---|
| 1187 | bNodes[edges[edge.id].bNode >> 1].first_edge = edges[edge.id].next_in; |
---|
| 1188 | } |
---|
| 1189 | if (edges[edge.id].next_in != -1) { |
---|
| 1190 | edges[edges[edge.id].next_in].prev_in = edges[edge.id].prev_in; |
---|
| 1191 | } |
---|
| 1192 | |
---|
| 1193 | edges[edge.id].next_out = first_free_edge; |
---|
| 1194 | first_free_edge = edge.id; |
---|
| 1195 | } |
---|
[2128] | 1196 | |
---|
[2116] | 1197 | void clear() { |
---|
| 1198 | aNodes.clear(); |
---|
| 1199 | bNodes.clear(); |
---|
| 1200 | edges.clear(); |
---|
| 1201 | first_anode = -1; |
---|
| 1202 | first_free_anode = -1; |
---|
| 1203 | first_bnode = -1; |
---|
| 1204 | first_free_bnode = -1; |
---|
| 1205 | first_free_edge = -1; |
---|
| 1206 | } |
---|
| 1207 | |
---|
[2160] | 1208 | void changeANode(const UEdge& edge, const Node& node) { |
---|
| 1209 | LEMON_ASSERT((node.id & 1) == 0, NodeSetError()); |
---|
| 1210 | if (edges[edge.id].prev_out != -1) { |
---|
| 1211 | edges[edges[edge.id].prev_out].next_out = edges[edge.id].next_out; |
---|
| 1212 | } else { |
---|
| 1213 | aNodes[edges[edge.id].aNode >> 1].first_edge = edges[edge.id].next_out; |
---|
| 1214 | } |
---|
| 1215 | if (edges[edge.id].next_out != -1) { |
---|
| 1216 | edges[edges[edge.id].next_out].prev_out = edges[edge.id].prev_out; |
---|
| 1217 | } |
---|
| 1218 | if (aNodes[node.id >> 1].first_edge != -1) { |
---|
| 1219 | edges[aNodes[node.id >> 1].first_edge].prev_out = edge.id; |
---|
| 1220 | } |
---|
| 1221 | edges[edge.id].prev_out = -1; |
---|
| 1222 | edges[edge.id].next_out = aNodes[node.id >> 1].first_edge; |
---|
| 1223 | aNodes[node.id >> 1].first_edge = edge.id; |
---|
| 1224 | edges[edge.id].aNode = node.id; |
---|
| 1225 | } |
---|
| 1226 | |
---|
| 1227 | void changeBNode(const UEdge& edge, const Node& node) { |
---|
| 1228 | LEMON_ASSERT((node.id & 1) == 1, NodeSetError()); |
---|
| 1229 | if (edges[edge.id].prev_in != -1) { |
---|
| 1230 | edges[edges[edge.id].prev_in].next_in = edges[edge.id].next_in; |
---|
| 1231 | } else { |
---|
| 1232 | bNodes[edges[edge.id].bNode >> 1].first_edge = edges[edge.id].next_in; |
---|
| 1233 | } |
---|
| 1234 | if (edges[edge.id].next_in != -1) { |
---|
| 1235 | edges[edges[edge.id].next_in].prev_in = edges[edge.id].prev_in; |
---|
| 1236 | } |
---|
| 1237 | if (bNodes[node.id >> 1].first_edge != -1) { |
---|
| 1238 | edges[bNodes[node.id >> 1].first_edge].prev_in = edge.id; |
---|
| 1239 | } |
---|
| 1240 | edges[edge.id].prev_in = -1; |
---|
| 1241 | edges[edge.id].next_in = bNodes[node.id >> 1].first_edge; |
---|
| 1242 | bNodes[node.id >> 1].first_edge = edge.id; |
---|
| 1243 | edges[edge.id].bNode = node.id; |
---|
| 1244 | } |
---|
| 1245 | |
---|
[2116] | 1246 | }; |
---|
| 1247 | |
---|
| 1248 | |
---|
| 1249 | typedef BpUGraphExtender< ListBpUGraphBase > ExtendedListBpUGraphBase; |
---|
| 1250 | |
---|
| 1251 | /// \ingroup graphs |
---|
| 1252 | /// |
---|
| 1253 | /// \brief A smart bipartite undirected graph class. |
---|
| 1254 | /// |
---|
| 1255 | /// This is a bipartite undirected graph implementation. |
---|
[2117] | 1256 | /// It is conforms to the \ref concept::BpUGraph "BpUGraph concept". |
---|
[2116] | 1257 | /// \sa concept::BpUGraph. |
---|
| 1258 | /// |
---|
[2160] | 1259 | class ListBpUGraph : public ExtendedListBpUGraphBase { |
---|
| 1260 | /// \brief ListBpUGraph is \e not copy constructible. |
---|
| 1261 | /// |
---|
| 1262 | ///ListBpUGraph is \e not copy constructible. |
---|
| 1263 | ListBpUGraph(const ListBpUGraph &) :ExtendedListBpUGraphBase() {}; |
---|
| 1264 | /// \brief Assignment of ListBpUGraph to another one is \e not |
---|
| 1265 | /// allowed. |
---|
| 1266 | /// |
---|
| 1267 | /// Assignment of ListBpUGraph to another one is \e not allowed. |
---|
| 1268 | void operator=(const ListBpUGraph &) {} |
---|
| 1269 | public: |
---|
| 1270 | /// \brief Constructor |
---|
| 1271 | /// |
---|
| 1272 | /// Constructor. |
---|
| 1273 | /// |
---|
| 1274 | ListBpUGraph() {} |
---|
| 1275 | |
---|
| 1276 | typedef ExtendedListBpUGraphBase Parent; |
---|
| 1277 | /// \brief Add a new ANode to the graph. |
---|
| 1278 | /// |
---|
| 1279 | /// \return the new node. |
---|
| 1280 | /// |
---|
| 1281 | Node addANode() { return Parent::addANode(); } |
---|
| 1282 | |
---|
| 1283 | /// \brief Add a new BNode to the graph. |
---|
| 1284 | /// |
---|
| 1285 | /// \return the new node. |
---|
| 1286 | /// |
---|
| 1287 | Node addBNode() { return Parent::addBNode(); } |
---|
| 1288 | |
---|
| 1289 | /// \brief Add a new edge to the graph. |
---|
| 1290 | /// |
---|
| 1291 | /// Add a new edge to the graph with an ANode and a BNode. |
---|
| 1292 | /// \return the new undirected edge. |
---|
| 1293 | UEdge addEdge(const Node& s, const Node& t) { |
---|
| 1294 | return Parent::addEdge(s, t); |
---|
| 1295 | } |
---|
| 1296 | |
---|
| 1297 | /// \brief Changes the ANode of \c e to \c n |
---|
| 1298 | /// |
---|
| 1299 | /// Changes the ANode of \c e to \c n |
---|
| 1300 | /// |
---|
| 1301 | ///\note The <tt>EdgeIt</tt>s and <tt>InEdgeIt</tt>s referencing |
---|
| 1302 | ///the changed edge remain valid. However <tt>OutEdgeIt</tt>s are |
---|
| 1303 | ///invalidated. |
---|
| 1304 | void changeANode(UEdge e, Node n) { |
---|
| 1305 | Parent::changeANode(e,n); |
---|
| 1306 | } |
---|
| 1307 | |
---|
| 1308 | /// \brief Changes the BNode of \c e to \c n |
---|
| 1309 | /// |
---|
| 1310 | /// Changes the BNode of \c e to \c n |
---|
| 1311 | /// |
---|
| 1312 | /// \note The <tt>EdgeIt</tt>s and <tt>OutEdgeIt</tt>s |
---|
| 1313 | /// referencing the changed edge remain |
---|
| 1314 | /// valid. However <tt>InEdgeIt</tt>s are invalidated. |
---|
| 1315 | void changeBNode(UEdge e, Node n) { |
---|
| 1316 | Parent::changeBNode(e,n); |
---|
| 1317 | } |
---|
| 1318 | |
---|
| 1319 | /// \brief Changes the source(ANode) of \c e to \c n |
---|
| 1320 | /// |
---|
| 1321 | /// Changes the source(ANode) of \c e to \c n |
---|
| 1322 | /// |
---|
| 1323 | ///\note The <tt>EdgeIt</tt>s and <tt>InEdgeIt</tt>s referencing |
---|
| 1324 | ///the changed edge remain valid. However <tt>OutEdgeIt</tt>s are |
---|
| 1325 | ///invalidated. |
---|
| 1326 | void changeSource(UEdge e, Node n) { |
---|
| 1327 | Parent::changeANode(e,n); |
---|
| 1328 | } |
---|
| 1329 | |
---|
| 1330 | /// \brief Changes the target(BNode) of \c e to \c n |
---|
| 1331 | /// |
---|
| 1332 | /// Changes the target(BNode) of \c e to \c n |
---|
| 1333 | /// |
---|
| 1334 | /// \note The <tt>EdgeIt</tt>s and <tt>OutEdgeIt</tt>s |
---|
| 1335 | /// referencing the changed edge remain |
---|
| 1336 | /// valid. However <tt>InEdgeIt</tt>s are invalidated. |
---|
| 1337 | void changeTarget(UEdge e, Node n) { |
---|
| 1338 | Parent::changeBNode(e,n); |
---|
| 1339 | } |
---|
| 1340 | |
---|
| 1341 | /// \brief Changes the source of \c e to \c n |
---|
| 1342 | /// |
---|
| 1343 | /// Changes the source of \c e to \c n. It changes the proper |
---|
| 1344 | /// node of the represented undirected edge. |
---|
| 1345 | /// |
---|
| 1346 | ///\note The <tt>EdgeIt</tt>s and <tt>InEdgeIt</tt>s |
---|
| 1347 | ///referencing the changed edge remain |
---|
| 1348 | ///valid. However <tt>OutEdgeIt</tt>s are invalidated. |
---|
| 1349 | void changeSource(Edge e, Node n) { |
---|
| 1350 | if (Parent::direction(e)) { |
---|
| 1351 | Parent::changeANode(e,n); |
---|
| 1352 | } else { |
---|
| 1353 | Parent::changeBNode(e,n); |
---|
| 1354 | } |
---|
| 1355 | } |
---|
| 1356 | /// \brief Changes the target of \c e to \c n |
---|
| 1357 | /// |
---|
| 1358 | /// Changes the target of \c e to \c n. It changes the proper |
---|
| 1359 | /// node of the represented undirected edge. |
---|
| 1360 | /// |
---|
| 1361 | ///\note The <tt>EdgeIt</tt>s and <tt>OutEdgeIt</tt>s |
---|
| 1362 | ///referencing the changed edge remain |
---|
| 1363 | ///valid. However <tt>InEdgeIt</tt>s are invalidated. |
---|
| 1364 | void changeTarget(Edge e, Node n) { |
---|
| 1365 | if (Parent::direction(e)) { |
---|
| 1366 | Parent::changeBNode(e,n); |
---|
| 1367 | } else { |
---|
| 1368 | Parent::changeANode(e,n); |
---|
| 1369 | } |
---|
| 1370 | } |
---|
| 1371 | /// \brief Contract two nodes. |
---|
| 1372 | /// |
---|
| 1373 | /// This function contracts two nodes. |
---|
| 1374 | /// |
---|
| 1375 | /// Node \p b will be removed but instead of deleting its |
---|
| 1376 | /// neighboring edges, they will be joined to \p a. The two nodes |
---|
| 1377 | /// should be from the same nodeset, of course. |
---|
| 1378 | /// |
---|
| 1379 | /// \note The <tt>EdgeIt</tt>s referencing a moved edge remain |
---|
| 1380 | /// valid. |
---|
| 1381 | void contract(const Node& a, const Node& b) { |
---|
| 1382 | LEMON_ASSERT(Parent::aNode(a) == Parent::aNode(b), NodeSetError()); |
---|
| 1383 | if (Parent::aNode(a)) { |
---|
| 1384 | for (IncEdgeIt e(*this, b); e!=INVALID;) { |
---|
| 1385 | IncEdgeIt f = e; ++f; |
---|
| 1386 | changeSource(e, a); |
---|
| 1387 | e = f; |
---|
| 1388 | } |
---|
| 1389 | } else { |
---|
| 1390 | for (IncEdgeIt e(*this, b); e!=INVALID;) { |
---|
| 1391 | IncEdgeIt f = e; ++f; |
---|
| 1392 | changeTarget(e, a); |
---|
| 1393 | e = f; |
---|
| 1394 | } |
---|
| 1395 | } |
---|
| 1396 | erase(b); |
---|
| 1397 | } |
---|
| 1398 | |
---|
| 1399 | }; |
---|
[2116] | 1400 | |
---|
| 1401 | |
---|
| 1402 | /// @} |
---|
[948] | 1403 | } //namespace lemon |
---|
[946] | 1404 | |
---|
[400] | 1405 | |
---|
[946] | 1406 | #endif |
---|