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How can I configure std::priority_queue to ignore duplicates?
When I add a key that is already contained then this new one should be ignored. (In my case, the priority for the old and the new one will always be exactly the same.)
Complexity-wise it should not make a difference: It will try to insert at the appropriate location, find the existing one there and do nothing. The question is just if std::priority_queue is configurable in that way.
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A PriorityQueue in Java does not have any restriction with regard to duplicate elements. If you want to ensure that two identical items are never present in the priority queue at the same time the simplest way would be to maintain a separate Set in parallel with the priority queue.
Yes, in C++ priority_queue, we may have duplicate values.
Answer: Yes. Priority Queue allows duplicate values.
Stack<T> accepts null as a valid value for reference types and allows duplicate elements.
You can implement a priority_queue out of an STL set.
Implementing a priority queue that can be iterated over in C++
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