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WeightedGraph::PositiveWeightedGraph API
WeightedGraph::PositiveWeightedGraph extends WeightedGraph::Graph and shares its behaviour, with the following differences:
# Add directed edge (source, destination) to the graph with given weight
# Requires that weight is a positive number
add_edge(source, destination, weight)
# Add undirected edge (vertex_a, vertex_b) to the graph with given weight
# Requires that weight is a positive number
add_undirected_edge(vertex_a, vertex_b, weight)