multimap

I would like to count the number of entries between two iterators of an std::multimap in less than O(N) time. Are there any tricks or clever ways to do this? Since std::multimap has bidirectional iterators, my understanding is that something like std::distance could do this in O(N) time. Additional details: The multimap 's key is an N-tuple. I'm trying to find the number of entries in the multimap whose key's first element is 0. The options for the first element of they key are 0 and 1, and the multimap uses a strict weak ordering in which the first element of the key is always the most

I'd like to stream a map with collection using Java 8 streams. For example, having the following data: Map<String, Collection<Integer>> data; I'd like to go over the elements handling each integer value with the corresponding key strings. For example: data.keyValueStream((k,v)-> ...) Any idea how to achieve this? Thanks. * Regarding the question "Why do you need it?", it could be a bunch of reasons and I'm not sure it's important. Anyhow, I'll "flow" with you... My specific scenario is to batch insert into a DB all the values, under their specific key. Let's keep it a general Java 8 stream

Is there any such thing as a combination of Guava's Cache and Multimap functionality available? Essentially, I need a collection where entries expire after a given time such as available in Cache but I have non-unique keys and I need the entries to expire independently. I think that Louis Wasserman provided the answer in one of the comments above, i.e. that there is no off-the-shelf combo of Multimap and Cache available. I have solved my problem/requirements with the solution outlined in pseudo-code below: private Cache<Integer,Object> cache = CacheBuilder.newBuilder().SomeConfig.build();

public class MultiMap_Test { public static void main(String[] args) { Multimap<String, String> myMultimap = ArrayListMultimap.create(); myMultimap.put("classlabel", "tid"); myMultimap.put("Y", "1"); myMultimap.put("Y", "2"); myMultimap.put("N", "4"); // Iterating over entire MutliMap for(String value : myMultimap.values()) { System.out.print(value); } } } The above code prints 1 2 tid 4 . I am not understanding why it is not printing tid 1 2 4 . Use LinkedListMultimap instead if you want to keep the insertion order: Multimap<String, String> myMultimap = LinkedListMultimap.create(); Why is

Closed. This question is off-topic. It is not currently accepting answers. Learn more . Want to improve this question? Update the question so it's on-topic for Stack Overflow. I have data like below: Key value ----- ------ car toyota car bmw car honda fruit apple fruit banana computer acer computer asus computer ibm ... (Each row of above data is an object with fields "key" and "value", all in one List List<DataObject> ) I would like to construct the data to a Map<String, List<String>> like following: "car" : ["toyota", "bmw", "honda"] "fruit" : ["apple","banana"] "computer" : ["acer","asus",

First part of the question is that I am trying to use boost::bimap, but from the documentation it is unclear to me how to define a bidirectional multimap. The second part of the question is that I need it to be a map in one direction and a multimap in the other direction, can this be done using boost::bimap ? Has anyone experience of this or can point me to the correct page ? ForEveR All is in documentation... http://www.boost.org/doc/libs/1_51_0/libs/bimap/doc/html/boost_bimap/the_tutorial/discovering_the_bimap_framework.html typedef boost::bimap<bimaps::multiset_of<int>, bimaps::set_of<int>>

I have parsed a HTML timetable and loaded every Subject to my class object. So i have arrayList of my Subjects which has information of name, teacher,... ,HOUR, and DAY now i want to reconstruct the table and so I need to categorize it first. I think that best would be to have structure like this: Monday: 1: Math, Czech, ... 2: History ... Tuesday: 1: English, Geo 2... ... There can be mutiple subjects in given hour, therefore I tried to used Multimap of Multimap, but I am not able to declare it during my for parsing. Multimap<String, Multimap<String, Subject>> timetable = HashMultimap.create(