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| 1 | /* |
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| 2 | Kruskal's algorithm to find a spanning tree of minimum weight |
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| 3 | If the graph is not connected, it gives a forest. |
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| 4 | */ |
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| 5 | #ifndef KRUSKAL_H |
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| 6 | #define KRUSKAL_H |
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| 7 | |
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| 8 | #include <union_find.h> |
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| 9 | |
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| 10 | namespace lemon { |
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| 11 | |
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| 12 | template <typename graph_type, typename T> |
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| 13 | class Kruskal { |
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| 14 | |
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| 15 | |
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| 16 | //Hasznos typedef-ek |
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| 17 | typedef typename graph_type::NodeIt NodeIt; |
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| 18 | typedef typename graph_type::EdgeIt EdgeIt; |
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| 19 | typedef typename graph_type::EachNodeIt EachNodeIt; |
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| 20 | typedef typename graph_type::EachEdgeIt EachEdgeIt; |
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| 21 | typedef typename graph_type::SymEdgeIt SymEdgeIt; |
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| 22 | |
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| 23 | //input |
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| 24 | graph_type& G; |
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| 25 | typename graph_type::EdgeMap<T> &weight; |
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| 26 | |
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| 27 | //Auxilliary variables |
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| 28 | typename graph_type::NodeMap<int> component(flowG); |
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| 29 | |
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| 30 | Kruskal( |
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| 31 | graph_type& _G, |
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| 32 | typename graph_type::EdgeMap<T> & _weight) |
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| 33 | : G(_G), |
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| 34 | weight(_weight), |
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| 35 | component(-1) |
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| 36 | { |
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| 37 | } |
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| 38 | |
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| 39 | /*Originally by Misi.*/ |
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| 40 | struct Edge_comp |
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| 41 | { |
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| 42 | NodeMap<graph_type, T> &d; |
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| 43 | Node_dist_comp(NodeMap<graph_type, T> &_d) : d(_d) {} |
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| 44 | |
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| 45 | bool operator()(const NodeIt& u, const NodeIt& v) const |
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| 46 | { return d.get(u) < d.get(v); } |
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| 47 | }; |
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| 48 | |
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| 49 | |
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| 50 | //Runs the algorithm |
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| 51 | void run() { |
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| 52 | |
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| 53 | |
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| 54 | |
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| 55 | } |
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| 56 | |
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| 57 | } |
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| 58 | |
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| 59 | }//namespacc lemon |
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| 60 | |
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| 61 | #endif |
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