BinaryHeap | JavaScript Implementation of the Binary Heap
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JavaScript Implementation of the Binary Heap.
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QUESTION
I try to make a binary heap in python but I get trouble printing it. I make sure that the logic in the program is right but when I want to try printing it I get the wrong result. This is what I want for program output:
Input:
...ANSWER
Answered 2021-Jun-13 at 15:33operation is a list (you called split), but you compare it as an int in your if statements. Also, you should compare it against "1", "2", ... not 1, 2, ...
So:
QUESTION
I want to transform types of "A" into "B" and collections of "A" to collections of "B" (and vice versa).
I have some misunderstanding of how the mechanism works.
I assumed implementing From on the base type would transfer to collections similarly without explicitly implementing.
For example:
...ANSWER
Answered 2021-Jun-01 at 11:13Consume the vec with into_iter and map Into::into before collecting the items into a new vector:
QUESTION
I can't imagine this hasn't been asked before, but I have searched everywhere and could not find the answer.
I have an iterable, which contains duplicate elements. I want to count number of times each element occurs in this iterable and return n-th most frequent one.
I have a working code which does exactly that, but I really doubt its the most optimal way to achieve this.
...ANSWER
Answered 2020-Oct-09 at 09:15Your implementation has a time complexity of Ω(n log n), where n is the length of the array. The optimal solution to this problem has a complexity of Ω(n log k) for retrieving the k-th most frequent element. The usual implementation of this optimal solution indeed involves a binary heap, but not in the way you used it.
Here's a suggested implementation of the common algorithm:
QUESTION
I am talking about std::collections::hash_map::Values struct, which you get from calling .values() method on aHashMap. This struct really confuses me, how can I access its values without iterating over them? I want to turn those values into a BinaryHeap like so:
ANSWER
Answered 2020-Oct-08 at 15:52The Values struct is defined as
An iterator over the values of a HashMap.
However, there is an easy way to convert the values into a BinaryHeap. Since it implements FromIterator, you can do
QUESTION
I am using the standard BinaryHeap as part of an algorithm where I need to retrieve the largest object (via some definition of largest). It could be possible that two non-equivalent elements are both equally large (and hence their relative order in the binary heap does not matter) - for example, I might be only interested in sorting on a single field of a multi-field struct.
Because of this, it would be somewhat unusual to have my type implement Ord and Eq. Instead, I should probably implement PartialOrd and PartialEq only. But, alas, BinaryHeap requires its elements to be Ord! Why is this so, and what is the most idiomatic way to use BinaryHeap with such types?
(As an aside, in C++, I would fairly easily write a custom comparator type in such a situation, and template the priority queue on the comparator type. So I don't think what I want to do is mathematically or algorithmically wrong.)
...ANSWER
Answered 2020-Aug-28 at 19:33PartialOrd gives you asymmetric and transitive ordering, that is a < b implies !(a > b) and a < b && b < c implies a < c. PartialOrd does not require for all elements to actually have a meaningful ordering at all, which is why PartialOrd::partial_cmp returns an Option where None means "I don't know" (notice that this does not impair the aforementioned requirements).
A binary heap requires total ordering for its elements, however, because a binary heap has to have the property that "the key stored in each node is either greater than or equal to (≥) or less than or equal to (≤) the keys in the node's children, according to some total order." (direct quote via Wikipedia).
Only Ord gives you asymmetric, transitive and total (exactly one of a < b, a == b or a > b) ordering. The requirement for total order leads to Ord::cmp returning a Ordering, not a Option, because the None-case is not allowed.
It is not uncommon the write specific implementations of PartialOrd and Ord in case you need specific behaviour. There is also the educe crate, which allows you to derive a more specific version of PartialOrd and Ord where certain fields are ignored.
QUESTION
I want to store MyStruct in a BinaryHeap using my own ordering criteria. I have to implement Ord and PartialEq, but will the heap use the PartialEq only for ordering or will it also use it to decide that MyStruct instance 1 and MyStruct instance 2 are logically the same object and hence could jiggle things around behind my back?
For example, could it decide "well next up is inst2 but I already have inst1 here in some cache and so I will just return that again"?
My instances are very different objects - they just have the same sort key.
I have this code. Is it bad because my Eq implementation only compares the things I want to sort on? I want to put these objects in a BinaryHeap. In my current code I put them in a Vec and sort after each insert which is suboptimal.
ANSWER
Answered 2020-Aug-04 at 00:33Rust will only use the Ord trait for the BinaryHeap (and the Ord trait requires the PartialEq trait). You can see it in the source code where they sift up the heap:
QUESTION
I am trying to solve a coupled ODE using the DifferentialEquations package in Julia, and trying to implement a Continuous Callback to check when a certain variable becomes small enough, so I can terminate the integration. The functions xdot, ddot are defined earlier, and this is working fine without the cb = callback argument.
...ANSWER
Answered 2020-Apr-20 at 12:08function w_enough(t,v,integrator)
w(v[1],v[2]) - 0.0001
end
QUESTION
I'm trying to implement A* search for Advent of Code 2019 (Yes, Slowpoke, I know). I've started like this:
...ANSWER
Answered 2020-Mar-01 at 20:04No, you cannot capture any environment in an impl block. Closures capture the environment, so you cannot use a closure as a function in an impl block.
Functions and methods are designed to be called from any context, so there's no guarantee that there even is an environment to be captured. The fact that we can declare types, functions, methods, etc. inside of another function is basically a syntax nicety.
I'd probably create a type that wraps Node and goal:
QUESTION
I am trying to construct a Max Heap and as each new value is inserted the value gets shifted up or down into its correct position, I have yet to implement a shift down function so as of right now I'm using a test that should only require the program to shift up. The test data is entered in the following order:
[16, 10, 14, 9, 7, 1, 4, 2, 8, 3]
I'm using the following code in the main class to insert the values in the heap:
...ANSWER
Answered 2020-Mar-02 at 22:17private void siftUp(int i) {
int parentIndex;
int tmp;
if (i != 0) { // error is this if statement
parentIndex = Parent(i);
if (Heap[parentIndex] < Heap[i]) {
tmp = Heap[parentIndex];
Heap[parentIndex] = Heap[i];
Heap[i] = tmp;
siftUp(parentIndex);
}
}
}
QUESTION
This is from Professor Mark Weiss in his book Data Structures and Algorithm Analysis in Java
...ANSWER
Answered 2017-Apr-14 at 17:02The design "philosophy" is that you can't instantiate an array of a type parameter, so you have to instantiate the array with a type that is legal. The only available legal types known to the method are array of Object or of Comparable, and the latter captures more knowledge about the type.
You are allowed to downcast to an array of the type parameter, and the return type has to be that, so downcasting is required.
It's the "philosophy" of necessity.
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