STIR | Software for Tomographic Image Reconstruction

Using beautifulsoup module. To parse tweets and cities to list of dictionaries you can use this example:

ET.parse parses from a file, instead of ET.parse try using ET.fromstring and that would probably help. I can't test your specific case since the URL you have written is giving me an error. So, try changing your code to this

The list in the error message refers to a list of items rendered by Array.map(). In your case, each menu item is a ul element, so the error message's "child in the list" refers to the ul. Move the key to the ul:

If hs should be part of your dataset, your code is working fine:

The useEffect hook is first executed after the first initial render, also the request is asynchronous meaning there will be at least one render before receiving the network response and the data object being populated with the value for instructions.

This is expected behaviour, you can choose to defer rendering part of the component until the data is fetch, or provide some loading state.

(For the sake of suggesting something)

Inspired by this answer, I am going to suggest an approach where you create your own type that inherits from List> (thereby preserving insertion order), and hides the base.Add() method using a method that ensures that only entries with unique keys are added to your list.

This works nicely for your specific use case if you can add your items one by one, and if adding items to your list is the only way you intend to change your list content. If there is a chance you may need to e.g. remove items from your list, the implementation needs to be extended to cover that.

Also worth mentioning: This implementation lets an incident of trying to add an entry with a non-unique key to the list pass silently. There's no screaming; the entry is simply not added.

Implementation:

heap is a data structure which is actually a complete binary tree with some extra properties. There are 2 types of Heaps:

1. MIN Heap
2. MAX Heap

in min heap the root has the lowest value in the tree and when you pop out the root the next lowest element comes on the top. To convert a tree into heap we use heapify algorithm. It is also know as priority queue in c++. and usually as a competitive programmer we use STL function for heap so that we dont have to get into the hustle of creating a heap from scratch. Max heap is just the opposite with largest at the root. Usually heap is used because it has a O(logN) time complexity for removing and inserting elements and hence can even work with tight constraints like 10^6.

Now i can understand you confusion between heap in memory and heap data structure but they are completely different things. Heap in data structure is just a way to store the data.

Your parsed JSON appears to be a list, not a map:

In your handler functions, the array index may go out of bound. So you should modify your handler functions like below: