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This question already has an answer here:

I've been coming over this question

unordered_multimap approach to adjacency list and graph search

which specifically asks about

I'm looking for suggestions on how to improve the usage of modern C++ features with this simple graph search algorithm, particularly with regard to the use of STL containers and lambda expressions.

As far as I can see that's all done fine, and I have no idea how to improve that further.

Does that deserve an answer like

Your code is fine don't worry

Maybe with some additional note, that it's good to use auto keywords and lambda expressions?

How should such question be handled?

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marked as duplicate by Jamal Dec 29 '16 at 20:31

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    \$\begingroup\$ You can very well make an answer that covers all of OP's code, while explaining why the code is perfect as it is. I did that once or twice, and happened to actually notice something (a comment IIRC) I would have done differently. \$\endgroup\$ – Mathieu Guindon Dec 29 '16 at 20:34

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