minmax-heap | 易学教程

How to build a Min-Max Heap in O(n) time complexity?

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问题 I found the topic of min-max heap on Wikipedia. I was wondering if there is any way of building this min-max heap in O(n) . I know you can do this with both min heap and max heap, but I'm not sure what would be the approach for this. Inserting an element takes O(log n) time complexity and I feel like this kind of tree can't be build more efficiently than O(n log n) . 回答1: Yes, it can. In your build-heap loop, you simply call TrickleDown , just like you would with a min heap or a max heap.

How do I perform a deletion of the kth element on a min-max heap?

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问题 A min-max heap can be useful to implement a double-ended priority queue because of its constant time find-min and find-max operations. We can also retrieve the minimum and maximum elements in the min-max heap in O(log 2 n) time. Sometimes, though, we may also want to delete any node in the min-max heap, and this can be done in O(log 2 n) , according to the paper which introduced min-max heaps: ... The structure can also be generalized to support the operation Find(k) (determine the kth

How do I perform a deletion of the kth element on a min-max heap?

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A min-max heap can be useful to implement a double-ended priority queue because of its constant time find-min and find-max operations. We can also retrieve the minimum and maximum elements in the min-max heap in O(log 2 n) time. Sometimes, though, we may also want to delete any node in the min-max heap, and this can be done in O(log 2 n) , according to the paper which introduced min-max heaps : ... The structure can also be generalized to support the operation Find(k) (determine the kth smallest value in the structure) in constant time and the operation Delete(k) (delete the kth smallest value

Java implementation for Min-Max Heap?

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Do you know of a popular library (Apache, Google, etc, collections) which has a reliable Java implementation for a min-max heap, that is a heap which allows to peek its minimum and maximum value in O(1) and to remove an element in O(log n) ? Louis Wasserman From Guava: MinMaxPriorityQueue . Instead of a max-min heap, could you use two instances of a java.util.PriorityQueue containing the same elements? The first instance would be passed a comparator which puts the maximum at the head, and the second instance would use a comparator which puts the minimum at the head. The downside is that add,

Java implementation for Min-Max Heap?

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问题 Do you know of a popular library (Apache, Google, etc, collections) which has a reliable Java implementation for a min-max heap, that is a heap which allows to peek its minimum and maximum value in O(1) and to remove an element in O(log n) ? 回答1: From Guava: MinMaxPriorityQueue. 回答2: Instead of a max-min heap, could you use two instances of a java.util.PriorityQueue containing the same elements? The first instance would be passed a comparator which puts the maximum at the head, and the second