implementations | Clean minimalist implementations | Learning library

by algorithmica-org C++ Version: Current License: No License

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kandi X-RAY | implementations Summary

implementations is a C++ library typically used in Tutorial, Learning, Example Codes applications. implementations has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

Clean minimalist implementations of popular competitive programming algorithms

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implementations has a low active ecosystem.

It has 69 star(s) with 12 fork(s). There are 6 watchers for this library.

It had no major release in the last 6 months.

There are 0 open issues and 1 have been closed. On average issues are closed in 63 days. There are 1 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of implementations is current.

Quality

implementations has no bugs reported.

Security

implementations has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

implementations does not have a standard license declared.

Check the repository for any license declaration and review the terms closely.

Without a license, all rights are reserved, and you cannot use the library in your applications.

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implementations releases are not available. You will need to build from source code and install.

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implementations Key Features

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implementations Examples and Code Snippets

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Community Discussions

Trending Discussions on implementations

What is the Sobel operator?

VSCode: Do we need to install extensions in order to use the Go to Definition?

Is it possible to use an Abstract Base Class as a mixin?

Does this class satisfy the Allocator requirement?

Async loop on a new thread in rust: the trait `std::future::Future` is not implemented for `()`

Understanding LinkingObjects in Realm Xcode 12, Also when to use it

Java SortHashMap equivalient in Python

Correct conditions for quickselect

Implementation of user defined array on stack and/or heap in C

Webpack compilation failed in react-native-web on {Node} i.e. Flow Syntax saying "You may need an appropriate loader to handle this file type"

QUESTION

What is the Sobel operator?

Asked 2021-Jun-15 at 18:13

I tried 5 different implementations of the Sobel operator in Python, one of which I implemented myself, and the results are radically different.

My questions is similar to this one, but there are still differences I don't understand with the other implementations.

Is there any agreed on definition of the Sobel operator, and is it always synonymous to "image gradient"?

Even the definition of the Sobel kernel is different from source to source, according to Wikipedia it is [[1, 0, -1],[2, 0, -2],[1, 0, -1]], but according to other sources it is [[-1, 0, 1],[-2, 0, 2],[-1, 0, 1]].

Here is my code where I tried the different techniques:

...

ANSWER

Answered 2021-Jun-15 at 14:22

according to wikipedia it's [[1, 0, -1],[2, 0, -2],[1, 0, 1]] but according to other sources it's [[-1, 0, 1],[-2, 0, 2],[-1, 0, 1]]

Both are used for detecting vertical edges. Difference here is how these kernels mark "left" and "right" edges.

For simplicity sake lets consider 1D example, and let array be

[0, 0, 255, 255, 255]

then if we calculate using padding then

kernel [2, 0, -2] gives [0, -510, -510, 0, 0]
kernel [-2, 0, 2] gives [0, 510, 510, 0, 0]

As you can see abrupt increase in value was marked with negative values by first kernel and positive values by second. Note that is is relevant only if you need to discriminate left vs right edges, when you want just to find vertical edges, you might use any of these 2 aboves and then get absolute value.

Source https://stackoverflow.com/questions/67987368

QUESTION

VSCode: Do we need to install extensions in order to use the Go to Definition?

Asked 2021-Jun-15 at 06:55

I'm using VSCode 1.56.2 on Windows, without any extension installed. I'm using VSCode for C++. The problem is that the go to definition, Go to declaration, Go To Type Definition, Go to References and Go to implementations are disabled and I cannot use them.

I'm new VSCode. Do I need to install special extensions? If so, is it possible to do it offline too? Like download the package file and move it to the extensions folder where VSCode is installed

...

ANSWER

Answered 2021-Jun-15 at 06:55

Yes, for each additional language you want to use in vscode, besides a few built-in ones like Javascript, Typescript, JSON and Markdown, you need to install an extension, which supports that language. Search for the particular language in the extension list in vscode or in the vscode marketplace.

Source https://stackoverflow.com/questions/67970600

QUESTION

Is it possible to use an Abstract Base Class as a mixin?

Asked 2021-Jun-15 at 03:43

TL;DR: Interested in knowing if it's possible to use Abstract Base Classes as a mixin in the way I'd like to, or if my approach is fundamentally misguided.

I have a Flask project I've been working on. As part of my project, I've implemented a "RememberingDict" class. It's a simple subclass of dict, with a handful of extra features tacked on: it remembers its creation time, it knows how to pickle/save itself to a disk, and it knows how to open/unpickle itself from a disk:

...

ANSWER

Answered 2021-Jun-15 at 03:43

You can get around the problems of subclassing dict by subclassing collections.UserDict instead. As the docs say:

Class that simulates a dictionary. The instance’s contents are kept in a regular dictionary, which is accessible via the data attribute of UserDict instances. If initialdata is provided, data is initialized with its contents; note that a reference to initialdata will not be kept, allowing it be used for other purposes.

Essentially, it's a thin regular-class wrapper around a dict. You should be able to use it with multiple inheritance as an abstract base class, as you do with AbstractRememberingDict.

Source https://stackoverflow.com/questions/67978006

QUESTION

Does this class satisfy the Allocator requirement?

Asked 2021-Jun-14 at 18:11

I made a custom allocator, but my code didn't compile on msvc and I'm not sure if my implementation satisfies the Allocator requirement (disregarding actual behavior of function implementations here). Here is a minimal example that reproduces the error on Visual Studio (16.11 P1 and 16.10):

...

ANSWER

Answered 2021-Jun-14 at 18:11

It does not.

An allocator rebound to a different value type must be constructible from the original allocator - this is the A a(b) row in the requirements you linked.

Your type fails that requirement.

Source https://stackoverflow.com/questions/67973597

QUESTION

Async loop on a new thread in rust: the trait `std::future::Future` is not implemented for `()`

Asked 2021-Jun-14 at 17:28

I know this question has been asked many times, but I still can't figure out what to do (more below).

I'm trying to spawn a new thread using std::thread::spawn and then run an async loop inside of it.

The async function I want to run:

...

ANSWER

Answered 2021-Jun-14 at 17:28

#[tokio::main] converts your function into the following:

Source https://stackoverflow.com/questions/67966950

QUESTION

Understanding LinkingObjects in Realm Xcode 12, Also when to use it

Asked 2021-Jun-13 at 15:23

In Realm, I had problem understanding ( Im new in Realm T,T ) the implementations of LinkingObjects , let's say a Person could have more than one Dog ( List of Dog ) so I would write the code such as below:

...

ANSWER

Answered 2021-Jun-13 at 15:23

You can think of LinkingObjects almost as a computed property - it automagically creates an inverse link to the parent object when the child object is added to the parent objects List.

So when a Dog is added to a person's dogs list, a person reference is added to the Dog's walkers list. Keeping in mind that it's a many to many relationship so technically if Person A adds Doggo, and Person B adds Doggo, the Doggo's inverse relationship 'walkers' will contain Person A and Person B

the app still can run normally without any diff

Which is true, it doesn't affect he operation of the app. HOWEVER the difference is that by removing the walkers LinkingObjects, there's no way to query Dogs for their Person and get Dog Results (i.e. you can't traverse the graph of the relationship back to the person)

In other words we can query Person for kinds of dog stuff

Source https://stackoverflow.com/questions/67950349

QUESTION

Java SortHashMap equivalient in Python

Asked 2021-Jun-13 at 11:53

Is there any Java SortedHashMap equivalent library in Python? Sorting dict keys in python every time we insert a key in dict doesn't look like an efficient approach.

I went through some reference implementations in python by third-party libraries similar to Java SortedHashMap but they don't look convincing.

Is there any stable and popular python implementation for this? which is already being used in some big opensource projects ?

One reference implementation sorted dict implementation

...

ANSWER

Answered 2021-Jun-13 at 11:53

Actually, there is no official library in python that provides the SortedHashMap implementation so there is no point looking for this. You can implement your own own by using similar concept that hava uses.

You can refer to this article for more details. TreeMap implementation in Java

Source https://stackoverflow.com/questions/67957787

QUESTION

Correct conditions for quickselect

Asked 2021-Jun-13 at 06:59

I am implementing the quick-select algorithm to get the kth element in an array, and I am stuck at a place where I don't know how to resolve. Here is my code that doesn't work:

...

ANSWER

Answered 2021-Jun-13 at 06:59

If k < partitionIndex, only check the left partition, else only check the right partition.

Source https://stackoverflow.com/questions/67954168

QUESTION

Implementation of user defined array on stack and/or heap in C

Asked 2021-Jun-12 at 21:13

I am trying to understand the difference between the stack and the heap whilst learning programming in C.
To do this, I have attempted to implement the binary search. I want to obtain the input data set of the binary search from the user. In order to do this, I want that the user be able to define the size of the data set (array in this case). Once I obtain the size of the array, I initialise the array and then ask the user to fill it up with values.

My (potentially wrong) understanding of the stack is, that the array can be initialised on the stack if its size is known at compile time. So, I tried the following to implement the user input on the stack (and it 'works'):

...

ANSWER

Answered 2021-May-30 at 18:15

Your programs using just stack allocation or just heap allocation are both fine. The only potential problem you have with the stack allocation is that if the array is too big (i.e. a few MB) it can overflow the stack, while the heap has a much higher limit.

The problem with the combined program is that this doesn't make sense:

Source https://stackoverflow.com/questions/67764265

QUESTION

Webpack compilation failed in react-native-web on {Node} i.e. Flow Syntax saying "You may need an appropriate loader to handle this file type"

Asked 2021-Jun-12 at 15:49

I am new to node/npm, react and react-native so very new to react-native-web as well. It's been 3 days for me to integrate react-native-web in a Hello World App generated using npx react-native init as per the doc. I tried using both templates: with and without typescript, but no success so far. The farthest I got is to run the app code written in index.web.js but if I add any component from ./src/components/ then I get errors, mostly of webpack.

I created a test repo for easy regeneration of error, So Steps to reproduce are as below:

Download this repo in your system.
npm install
npm run web

Now you'll see the error in the terminal.

Versions:

metro-react-native-babel-preset: 0.66.0
node: 16.3.0
npm: 7.8.0
OS: Windows 10 - 64 bit

I followed official documentation but with webpack@^4 and referred this article and somehow managed to reach the below situation:

Webpage is getting rendered if my whole code is inside index.web.js.
But when I import App inside this then I get compilation failed due to loader error.

Working index.web.js:

...

ANSWER

Answered 2021-Jun-12 at 15:49

Finally, It's been resolved, my Hello World is done.

These 2 replies from the maintainer himself (@necolas) on this discussion helped me to get the issue.

Reply 1 by @necolas This line in the stack trace is telling you that you're trying to bundle RN internal code in your web bundle: node_modules/react-native/Libraries/NewAppScreen/index.js.

First, you should not be loading any of the RN package on web, especially not parts that aren't part of the public API . Second, as mentioned in the inline comments of the config you pasted above, you need to explicitly list everything in node_modules that needs compiling.

Reply 2 by @necolas

Source https://stackoverflow.com/questions/67908299

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