C++ optimal graph representation for prims algorithm (without boost) -


i looking representation of graph prim's algorithm.

e.g. represent graph bfs 

typedef std::unordered_map<int, std::queue<int> > gr;

is elegant , concise, maps each vertex queue of neighbours.

for dijkstra it's little more complex (weights in representation)

typedef std::pair<int, double> to_weighted_edge; typedef std::unordered_map<int, std::vector<to_weighted_edge> > gr;
  • use of priority queue.

if similar structure follows in prim's algorithm however, source of each edge need stored , if graph represented like:

typedef std::pair < std::pair<int,int>, double> from_to_weighted_edge; typedef std::unordered_map<int, std::vector<from_to_weighted_edge> > gr;

then there redundant info stored (the source/from vertex).

any suggestions optimal graph representation in c++ prim's algorithm welcome!

ps: 1 of course represent graph std::vector<from_to_weighted_edge> there wouldn't o(1) lookup of neighbors, common characteristic of common graph representations.


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