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2. What's the difference between std::multimap<key, value> and...

   stackoverflow.com/questions/8602068

   The multimap stores pairs of (key, value) where both key and value can appear several times. The map<key, set<value>> will only store each value once for a specific key. To do that, it will have to be able to compare the values, not just the keys.

3. When does using a std::multimap make sense - Stack Overflow

   stackoverflow.com/questions/8342445

   Currently I am trying to figure out, when using a std::multimap does make sense. As far as I can see, one can easily build ones own multimap implementation by combining std::map and std::vector. So I am left with the question when each of these datastructures should be used. Simplicity: A std::multimap is definitely simpler to use, because one ...

4. How is the C++ multimap container implemented? - Stack Overflow

   stackoverflow.com/questions/6258387

   33. The C++ standard does not define how the standard containers should be implemented, it only gives certain constraints like the one you say for vectors. multimaps have certain runtime complexity (O (lg n) for the interesting operations) and other guarantees, and can be implemented as red-black trees.

5. c++ - What is the usage of std::multimap? - Stack Overflow

   stackoverflow.com/questions/73618656/what-is-the-usage-of-stdmultimap

   A std::multimap<K,V> can be compared to a std::map<K,std::vector<V>> but with the interface you'd expect when you want to map more than a single value to the same key. For example std::multimap iterators lets you iterate all key-value pairs in the multimap in one go. With the map of vectors you'd have to use the maps iterators and the vectors ...

6. Is there a 'multimap' implementation in Python? - Stack Overflow

   stackoverflow.com/questions/1731971

   There is no multi-map in the Python standard libs currently. WebOb has a MultiDict class used to represent HTML form values, and it is used by a few Python Web frameworks, so the implementation is battle tested. Werkzeug also has a MultiDict class, and for the same reason. answered Nov 16, 2010 at 5:16.

7. c# - multimap in .NET - Stack Overflow

   stackoverflow.com/questions/380595

   Very simple multimap implementation. Share. Follow answered Apr 6, 2010 at 11:53. Amitd Amitd. 4,849 8 8 ...

8. java - How to efficiently iterate a Multimap? - Stack Overflow

   stackoverflow.com/questions/43919878

   I have the following multimap: Multimap<String,Multimap<String,Integer>> map = ArrayListMultimap.create(); I need to iterate it, but I am stuck.

9. How to iterate through a multimap and print values grouped by key...

   stackoverflow.com/questions/26527680

   I have std::multimap<string, MyObject*> dataMap; where the keys are MyObject.name and all MyObjects are stored in a std::vector<MyObject>. After filling the map I need to print the contents of dataMap grouped by the same key, where I first need number of same keys with the help of dataMap.count(MyObject.name) and then all the values with this key.

10. How to create a Multimap<K,V> from a Map<K, Collection<V>>?

    stackoverflow.com/questions/3093863

    Here is a useful generic version that I wrote for my StuffGuavaIsMissing class. /** * Creates a Guava multimap using the input map.

11. java - How to iterate through google multimap - Stack Overflow

    stackoverflow.com/questions/3934470

    for (Collection collection : multimap.asMap().values()) { ... You can also get the corresponding Collection for each key in the keySet() using get as described by bwawok. Edit: I didn't think about the fact that Java 1.4 didn't have the foreach loop either, so of course each loop above would have to be written using the Iterator s directly.