Update graph.h
change comment for Graph::FindEdgeId method.
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@ -617,9 +617,9 @@ class Graph {
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int num_edge_ids() const { return edges_.size(); }
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// Returns the Edge associated with an id, or nullptr if no edge
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// with that id (the node with that id was removed and the id has
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// with that id (the edge with that id was removed and the id has
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// not yet been re-used). *this owns the returned instance.
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// REQUIRES: 0 <= id < num_node_ids().
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// REQUIRES: 0 <= id < num_edge_ids().
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const Edge* FindEdgeId(int id) const { return edges_[id]; }
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// Access to the set of all edges. Example usage:
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