I'm trying to optimize an algorithm that counts permutations with specific constraints. Given integers n, t, a, b where: n is the length of permutation (1 to n) t is the required number of fixed p...

Can I rely on Snowflake's lazy evaluation for testing and exception throwing? Are CTEs lazily evaluated? Is this documented? (related question: Assertions in Snowflake)

I am trying to implement two classes A and B which contain data stored in std::unique_ptr container, and A could transform to B with some calculation. The class A and class B are shown as below. Th...

Is there any way (possibly a dirty hack) to create an ImmutableArray which will just use a specified array, instead of copying it over? I have an array which I know won't change, and I want to crea...

When I add a UILabel with text to a UIView and then scale the UIView, the contents is displayed with pixelation. The greater the scale factor, the greater the pixelation. I understand using a CATe...

I would like to know how else I can optimize bubble sort so that it overlooks elements that have already been sorted, even after the first pass. Eg. [4, 2, 3, 1, 5, 6] --> [2, 3, 1, **4, 5, 6**]...

Here is a bounded loop that increments two locations of the same buffer. unsigned int getid(); void foo(unsigned int *counter, unsigned int n) { unsigned int A = getid(); unsigned int B = getid()...

Unfortunately, the standard C++ library doesn't have a single call for sincos, which gives a place for this question. First question: If I want to calculate a sin and a cos, is it cheaper to calc...

I came up with the following implementation for the Greedy Set Cover after much discussion regarding my original question here. From the help I received, I encoded the problem into a "Greedy Set Co...

Suppose I have a matrix that is 100000 x 100 import numpy as np mat = np.random.randint(2, size=(100000,100)) I wish to go through this matrix, and if each row contains entirely either 1 or 0 I...

Key Points: I have a default ball trajectory generated using some code(provided below). Lets name this trajectory Initial Trajectory. Next I have an actual ball whose trajectory I need to estimate...

I have an upper-triangular matrix of np.float64 values, like this: array([[ 1., 2., 3., 4.], [ 0., 5., 6., 7.], [ 0., 0., 8., 9.], [ 0., 0., 0., 10.]]) I would like to convert this into the c...

i'm trying to optimize this website: electronicsportsitalia-it and when I try to analyze it on Google PageSpeed the platform says that there is a google font blocking the page rendering: https://f...

I'm working on a small Python program for myself and I need an algorithm for fast multiplication of a huge array with prime powers (over 660 000 numbers, each is 7 digits). The result number is ove...

I just reduced this SVG: <?xml version="1.0" standalone="no"?> <svg viewBox="0 0 480 150" style="background-color:#ffffff00" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink=...

I have been trying to understand how to write the cache-friendly code. So as a first step, i was trying to understand the performance difference between array row-major access and column major acce...

Let's say you have an enum: enum Expr { binExp, unExp, Literal, Group, } Should you prefer match or if/else chains to call methods based on Expr? match self { Expr::binExp => todo!(), ...

At some point in my program I compute an integer divisor d. From that point onward d is going to be constant. Later in the code I will divide by that d several times - performing an integer divisi...

I want to fit non-negative parameters (xs in the code) to a function fp, given by where v and L are fixed, given parameters. Computing fp can be done relatively quickly by vectorizing it and using...

Please note that this question is not about YUV422 to RGB conversion! I have this code for a pixel order YUV422 to RGB conversion. static void yuv422ToRGB(unsigned char* img, int width, int height...

The application I'm working on is very focused on performance, and as such needs to keep allocations down to a minimum to keep GC stalls down. I was surprised to find that System.Guid does not exp...

My one test file with 7 empty tests is taking 5+ seconds to start running. I've used both flutter test and the Dart test runner in VS Code, and they both take about the same amount of time. My whol...

I'm looking for the best way to get the first and the last day of a last month. I use them for make SQL queries to get stats of last month. I think that this is the best way, more optimized ...

I have a large SPA with a single large CSS file which contains many rules. Some of them are outdated and should be refactored or removed. It is compiled from a set of SCSS source files. I am now r...

I'd like to define a boolean function (with n inputs and m outputs) in a tabular form. I'd like to find an optimal boolean expression which implements the function. Optimal here means that, impleme...