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1 | // -*- C++ -*- // |
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2 | |
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3 | #ifndef LEMON_MA_ORDER_H |
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4 | #define LEMON_MA_ORDER_H |
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5 | |
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6 | #include <vector> |
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7 | #include <functional> |
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8 | #include <bin_heap.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, |
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13 | typename Heap = BinHeap<typename Graph::Node, int, |
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14 | typename Graph::NodeMap<int>, |
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15 | std::greater<int> >, |
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16 | typename OrderVect = std::vector<typename Graph::Node> > |
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17 | class MAOrder { |
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18 | |
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19 | typedef typename Graph::Node Node; |
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20 | typedef typename Graph::NodeIt NodeIt; |
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21 | typedef typename Graph::Edge Edge; |
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22 | typedef typename Graph::OutEdgeIt OutEdgeIt; |
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23 | typedef typename Graph::NodeMap<int> NodeMapInt; |
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24 | |
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25 | const Graph& G; |
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26 | |
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27 | OrderVect& order; |
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28 | |
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29 | |
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30 | public: |
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31 | |
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32 | MAOrder(const Graph& _G, OrderVect& _order) : G(_G), order(_order) {} |
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33 | |
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34 | void run() |
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35 | { |
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36 | Node first; |
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37 | G.first(first); |
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38 | run(first); |
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39 | } |
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40 | |
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41 | void run(Node first) |
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42 | { |
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43 | NodeMapInt heapMap(G, -1); |
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44 | Heap heap(heapMap); |
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45 | |
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46 | heap.push(first, 0); |
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47 | |
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48 | NodeIt n; |
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49 | G.first(n); |
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50 | while ( G.valid(n) ) { |
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51 | |
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52 | while(!heap.empty()) { |
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53 | Node a = heap.top(); |
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54 | heap.pop(); |
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55 | order.push_back(a); |
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56 | |
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57 | OutEdgeIt e; |
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58 | G.first(e,a); |
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59 | for (;G.valid(e);G.next(e)) { |
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60 | Node v = G.target(e); // hmm |
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61 | if (heap.state(v) == Heap::IN_HEAP ) { |
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62 | heap.decrease(v, heap[v]+1); |
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63 | } |
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64 | else if (heap.state(v) == Heap::PRE_HEAP) { |
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65 | heap.push(v, 1); |
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66 | } |
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67 | } |
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68 | |
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69 | } |
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70 | |
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71 | while( G.valid(n) ) { |
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72 | if (heap.state(n) == Heap::PRE_HEAP) { |
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73 | heap.push(n,0); |
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74 | break; |
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75 | } |
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76 | G.next(n); |
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77 | } |
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78 | } |
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79 | |
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80 | } |
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81 | |
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82 | |
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83 | }; |
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84 | |
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85 | } // namespace lemon |
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86 | |
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87 | #endif // LEMON_MA_ORDER_H |
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