[9] | 1 | #ifndef MARCI_BFS_HH |
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| 2 | #define MARCI_BFS_HH |
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| 3 | |
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| 4 | #include <queue> |
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| 5 | |
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| 6 | #include <marci_property_vector.hh> |
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| 7 | |
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| 8 | namespace marci { |
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| 9 | |
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| 10 | template <typename graph_type> |
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| 11 | struct bfs { |
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[19] | 12 | typedef typename graph_type::node_iterator node_iterator; |
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| 13 | typedef typename graph_type::edge_iterator edge_iterator; |
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| 14 | typedef typename graph_type::each_node_iterator each_node_iterator; |
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| 15 | typedef typename graph_type::out_edge_iterator out_edge_iterator; |
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[9] | 16 | graph_type& G; |
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| 17 | node_iterator s; |
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| 18 | node_property_vector<graph_type, bool> reached; |
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| 19 | node_property_vector<graph_type, edge_iterator> pred; |
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| 20 | node_property_vector<graph_type, int> dist; |
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| 21 | std::queue<node_iterator> bfs_queue; |
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| 22 | bfs(graph_type& _G, node_iterator _s) : G(_G), s(_s), reached(_G), pred(_G), dist(_G) { |
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| 23 | bfs_queue.push(s); |
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[19] | 24 | for(each_node_iterator i=G.first_node(); i.valid(); ++i) |
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[9] | 25 | reached.put(i, false); |
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| 26 | reached.put(s, true); |
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| 27 | dist.put(s, 0); |
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| 28 | } |
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| 29 | |
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| 30 | void run() { |
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| 31 | while (!bfs_queue.empty()) { |
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| 32 | node_iterator v=bfs_queue.front(); |
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| 33 | out_edge_iterator e=G.first_out_edge(v); |
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| 34 | bfs_queue.pop(); |
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[19] | 35 | for( ; e.valid(); ++e) { |
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[9] | 36 | node_iterator w=G.head(e); |
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| 37 | std::cout << "scan node " << G.id(w) << " from node " << G.id(v) << std::endl; |
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| 38 | if (!reached.get(w)) { |
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| 39 | std::cout << G.id(w) << " is newly reached :-)" << std::endl; |
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| 40 | bfs_queue.push(w); |
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| 41 | dist.put(w, dist.get(v)+1); |
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| 42 | pred.put(w, e); |
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| 43 | reached.put(w, true); |
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| 44 | } else { |
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| 45 | std::cout << G.id(w) << " is already reached" << std::endl; |
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| 46 | } |
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| 47 | } |
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| 48 | } |
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| 49 | } |
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| 50 | }; |
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| 51 | |
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| 52 | template <typename graph_type> |
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| 53 | struct bfs_visitor { |
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[19] | 54 | typedef typename graph_type::node_iterator node_iterator; |
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| 55 | typedef typename graph_type::edge_iterator edge_iterator; |
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| 56 | typedef typename graph_type::out_edge_iterator out_edge_iterator; |
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[9] | 57 | graph_type& G; |
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| 58 | bfs_visitor(graph_type& _G) : G(_G) { } |
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| 59 | void at_previously_reached(out_edge_iterator& e) { |
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| 60 | //node_iterator v=G.tail(e); |
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| 61 | node_iterator w=G.head(e); |
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| 62 | std::cout << G.id(w) << " is already reached" << std::endl; |
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| 63 | } |
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| 64 | void at_newly_reached(out_edge_iterator& e) { |
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| 65 | //node_iterator v=G.tail(e); |
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| 66 | node_iterator w=G.head(e); |
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| 67 | std::cout << G.id(w) << " is newly reached :-)" << std::endl; |
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| 68 | } |
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| 69 | }; |
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| 70 | |
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| 71 | template <typename graph_type, typename reached_type, typename visitor_type> |
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| 72 | struct bfs_iterator { |
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[19] | 73 | typedef typename graph_type::node_iterator node_iterator; |
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| 74 | typedef typename graph_type::edge_iterator edge_iterator; |
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| 75 | typedef typename graph_type::out_edge_iterator out_edge_iterator; |
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[9] | 76 | graph_type& G; |
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| 77 | std::queue<out_edge_iterator>& bfs_queue; |
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| 78 | reached_type& reached; |
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| 79 | visitor_type& visitor; |
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| 80 | void process() { |
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[19] | 81 | while ( !bfs_queue.empty() && !bfs_queue.front().valid() ) { bfs_queue.pop(); } |
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[9] | 82 | if (bfs_queue.empty()) return; |
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| 83 | out_edge_iterator e=bfs_queue.front(); |
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| 84 | //node_iterator v=G.tail(e); |
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| 85 | node_iterator w=G.head(e); |
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| 86 | if (!reached.get(w)) { |
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| 87 | visitor.at_newly_reached(e); |
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| 88 | bfs_queue.push(G.first_out_edge(w)); |
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| 89 | reached.put(w, true); |
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| 90 | } else { |
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| 91 | visitor.at_previously_reached(e); |
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| 92 | } |
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| 93 | } |
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| 94 | bfs_iterator(graph_type& _G, std::queue<out_edge_iterator>& _bfs_queue, reached_type& _reached, visitor_type& _visitor) : G(_G), bfs_queue(_bfs_queue), reached(_reached), visitor(_visitor) { |
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[19] | 95 | //while ( !bfs_queue.empty() && !bfs_queue.front().valid() ) { bfs_queue.pop(); } |
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| 96 | valid(); |
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[9] | 97 | } |
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| 98 | bfs_iterator<graph_type, reached_type, visitor_type>& operator++() { |
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[19] | 99 | //while ( !bfs_queue.empty() && !bfs_queue.front().valid() ) { bfs_queue.pop(); } |
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[9] | 100 | //if (bfs_queue.empty()) return *this; |
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[19] | 101 | if (!valid()) return *this; |
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[9] | 102 | ++(bfs_queue.front()); |
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[19] | 103 | //while ( !bfs_queue.empty() && !bfs_queue.front().valid() ) { bfs_queue.pop(); } |
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| 104 | valid(); |
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[9] | 105 | return *this; |
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| 106 | } |
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| 107 | //void next() { |
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[19] | 108 | // while ( !bfs_queue.empty() && !bfs_queue.front().valid() ) { bfs_queue.pop(); } |
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[9] | 109 | // if (bfs_queue.empty()) return; |
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| 110 | // ++(bfs_queue.front()); |
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[19] | 111 | // while ( !bfs_queue.empty() && !bfs_queue.front().valid() ) { bfs_queue.pop(); } |
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[9] | 112 | //} |
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[19] | 113 | bool valid() { |
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| 114 | while ( !bfs_queue.empty() && !bfs_queue.front().valid() ) { bfs_queue.pop(); } |
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[9] | 115 | if (bfs_queue.empty()) return false; else return true; |
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| 116 | } |
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| 117 | //bool finished() { |
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[19] | 118 | // while ( !bfs_queue.empty() && !bfs_queue.front().valid() ) { bfs_queue.pop(); } |
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[9] | 119 | // if (bfs_queue.empty()) return true; else return false; |
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| 120 | //} |
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| 121 | operator edge_iterator () { return bfs_queue.front(); } |
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| 122 | |
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| 123 | }; |
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| 124 | |
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[11] | 125 | template <typename graph_type, typename reached_type> |
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| 126 | struct bfs_iterator1 { |
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[19] | 127 | typedef typename graph_type::node_iterator node_iterator; |
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| 128 | typedef typename graph_type::edge_iterator edge_iterator; |
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| 129 | typedef typename graph_type::out_edge_iterator out_edge_iterator; |
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[11] | 130 | graph_type& G; |
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| 131 | std::queue<out_edge_iterator>& bfs_queue; |
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| 132 | reached_type& reached; |
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[19] | 133 | bool _newly_reached; |
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[11] | 134 | bfs_iterator1(graph_type& _G, std::queue<out_edge_iterator>& _bfs_queue, reached_type& _reached) : G(_G), bfs_queue(_bfs_queue), reached(_reached) { |
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[19] | 135 | valid(); |
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| 136 | if (!bfs_queue.empty() && bfs_queue.front().valid()) { |
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[11] | 137 | out_edge_iterator e=bfs_queue.front(); |
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| 138 | node_iterator w=G.head(e); |
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| 139 | if (!reached.get(w)) { |
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| 140 | bfs_queue.push(G.first_out_edge(w)); |
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| 141 | reached.put(w, true); |
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[19] | 142 | _newly_reached=true; |
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[11] | 143 | } else { |
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[19] | 144 | _newly_reached=false; |
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[11] | 145 | } |
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| 146 | } |
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| 147 | } |
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| 148 | bfs_iterator1<graph_type, reached_type>& operator++() { |
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[19] | 149 | if (!valid()) return *this; |
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[11] | 150 | ++(bfs_queue.front()); |
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[19] | 151 | valid(); |
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| 152 | if (!bfs_queue.empty() && bfs_queue.front().valid()) { |
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[11] | 153 | out_edge_iterator e=bfs_queue.front(); |
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| 154 | node_iterator w=G.head(e); |
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| 155 | if (!reached.get(w)) { |
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| 156 | bfs_queue.push(G.first_out_edge(w)); |
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| 157 | reached.put(w, true); |
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[19] | 158 | _newly_reached=true; |
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[11] | 159 | } else { |
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[19] | 160 | _newly_reached=false; |
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[11] | 161 | } |
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| 162 | } |
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| 163 | return *this; |
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| 164 | } |
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[19] | 165 | bool valid() { |
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| 166 | while ( !bfs_queue.empty() && !bfs_queue.front().valid() ) { bfs_queue.pop(); } |
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[11] | 167 | if (bfs_queue.empty()) return false; else return true; |
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| 168 | } |
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| 169 | operator edge_iterator () { return bfs_queue.front(); } |
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[19] | 170 | bool newly_reached() { return _newly_reached; } |
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[11] | 171 | |
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| 172 | }; |
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[9] | 173 | |
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| 174 | } // namespace marci |
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| 175 | |
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| 176 | #endif //MARCI_BFS_HH |
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