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[350] | 1 | // -*- C++ -*- // |
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| 2 | |
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| 3 | #ifndef HUGO_MA_ORDER_H |
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| 4 | #define HUGO_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 hugo { |
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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.head(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 hugo |
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| 86 | |
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| 87 | #endif // HUGO_MA_ORDER_H |
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