From a pool of n questions generate as many quizzes as possible

From a pool of n questions generate as many quizzes as possible Each question contain questionId,difficulty level and tag.


  • questionId in 1 to n and unique
  • question tag in(tag1,tag2,tag3,tag4,tag5,tag6)
  • difficulty level in(easy,medium,hard)
  • 300<=n<= 1000
  • A question can be used only once in any quiz


  • minimum 1 question from each tag

  • minimum 2 question from each difficulty level

  • 10 question per quiz.


  • a Single line containing n
  • next n lines containing 1 question description each(as shown below)
  • questionId difficulty_level tag


  • no of quizzes possible

How to generate trusted SSL certificate for secure MQTT?

I am a beginner with information security and everything about SSL just goes over my head.

Currently I’m trying to get an IoT device(ESP32) to connect to an MQTT broker, in my case, over TLS. The device has been flashed with Mongoose OS which relies on mbedTLS library to secure MQTT.

The issue which I face is that mbedTL says that “The certificate is not correctly signed by the trusted CA” when I use a self signed certificate. Where can I get this trusted certificate or how am I supposed to generate it? I’ve been digging the internet for quite some time now but sadly, nothing is present in the Mongoose-OS docs.

Please tell me the steps I need to follow to get my secure MQTT connection up and running.

How would you generate files with several different rules?

Okay, the title is kind of cryptic because I’m lacking terminology (part of the problem).


Let’s say you want to generate data corresponding to one specific, standardized paper document. But you have millions of people filling out this document, some of them are lying — but there’s several different ways (possibly hundreds) of lying, and many of the document’s fields are interdependent. I want to generate all these types of lies via some randomized distribution.

Additionally, with respect to this form, it’s impossible to go through each field of the form in a sequential order and capture the nuance and inter-dependency of the data/lie relationship. Instead, you could (the path I see) opt for a method where each type of fraudulent form has hard and fast rules for its generation — logic and static values contained in some config file — and then just boil it down to copy and pasting the function into function_1, function_2 etc, which are almost identical besides the small changes which capture the characteristic of whatever lie they correspond to.

But then it’s sort of ridiculous to write a function for each of those “lie rules”, even if you’re almost copy-pasting. But I’ve never encountered a situation where there’s so many and unique cases (some with large differences and logic) for creating the same piece of data. Is there well-known approach/name to this problem? Or does anybody have any suggestions?

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Generate triangular surface mesh of convex hull spanned by 8 points in 3D-Space

I am looking for a numerically efficient algorithm to get a triangular surface mesh of the convex hull given by 8 points in three-dimensional space.

For context, the use case is the following:

I have a numerical Simulation calculating the time evolution of a field with three components on a lattice. Say we have lattice coordinates $ (i,j,k)$ , then every lattice point $ (i,j,k)$ has a field vector $ (\phi_1, \phi_2 , \phi_3)$ attached.

For relevant physics, I need to now take unit cells on my lattice, so the 8 corners of a little cube of my lattice. I take the field vectors $ (\phi_1, \phi_2 , \phi_3)$ of every corner of my unit cell and then interpret their convex hull as a closed volume in $ \phi$ -space, with $ \phi$ -space being the 3D space given by the $ (\phi_1,\phi_2,\phi_3)$ coordinates.

I am now interested if the volume spanned by these 8 points in $ \phi$ -space does the following things:

  1. If it contains the origin, $ (0 ,0 ,0 )$

  2. If a Ray traveling from the origin in $ (-1,0,0)$ -direction pierces my given volume

The idea to evaluate both 1.) and 2.) at the same time is to decompose the surface of the convex hull into triangles. For a triangle in 3-Dimensional space, it is easy to evaluate whether it is pierced by my given Ray in $ (-1,0,0)$ direction. I can then count how many triangles are pierced. If exactly two triangles are pierced (because of convexity), I know the cell satisfies condition 2.). If exactly one triangle is pierced, I know the origin has to lie inside my volume, that is condition 1.) is satisfied. Lastly, when no triangles are pierced, none of the above apply.

I think this approach is probably relatively fast. Speed is critical, because I have approximately $ 10^6 … 10^9$ cells to evaluate per sweep across my lattice.

I’d be interested in any other approaches as well, though.

Update: So, I think possibly a 3D-Gift-Wrapping algorithm would atleast produce the required result, because it creates the convex hull by consecutively finding triangles on the surface? I will have to try that out tomorrow.

Can I do better than that in terms of efficiency?

Generate random matrix and its inverse

I want to randomly generate a pair of invertible matrices $ A,B$ that are inverses of each other. In other words, I want to sample uniformly at random from the set of pairs $ A,B$ of matrices such that $ AB=BA=\text{Id}$ .

Is there an efficient way to do this? Can we do it with expected running time approaching $ O(n^2)$ ?

Assume we are working with $ n\times n$ boolean matrices (all entries 0 or 1, arithmetic done modulo 2). I am fine with an approximate algorithm (say, it samples from a distribution exponentially close to the desired distribution). My motivation is solely curiousity; I have no practical application in mind.

The obvious approach is to generate a random invertible matrix $ A$ , compute its inverse, and set $ A=B^{-1}$ . This has running time $ O(n^\omega)$ , where $ \omega$ is the matrix multiplication constant — something in the vicinity of $ O(n^3)$ in practice. Can we do better?

An approach that occurred to me is to choose a set $ T$ of simple linear transformations on matrices such that, for each $ t \in T$ , we can apply the modifications $ M \mapsto tM$ and $ M \mapsto Mt^{-1}$ in $ O(1)$ time. Then, we could set $ A_0=B_0=\text{Id}$ , and in step $ i$ , sample a random $ t$ from $ T$ , set $ A_{i+1}=tA_i$ and $ B_{i+1}=B_it^{-1}$ , and repeat for some number of steps (say $ O(n^2 \log n)$ iterations). However I’m not sure how we would prove how quickly this approaches the desired distribution.

Generate aerial image based on images taken on ground

I am trying to reconstruct aerial(top view) image of small area with photos taken by mobile device. Such as part of a street or other flat scenes. I want to use 3D reconstruction tools to process images then map the result to top view. How do I avoid error from highly dynamic environment (cars, people)? Or is there any other ways to do this?

Is there a way to cycle through levels of a filter and generate outputs in R?

I am trying to generate report card outputs using R, but have over 200 agents (levels in my factor) that require their own report (tibble output that I can write to .csv or html).

I have included a reproducible example below.

library(tidyverse) Agents <- c("A", "B", "C") Month <- c("May", "June", "July") Score1 <- c(5,7,1) Score2 <- c(7,8,3)  df <- cbind(Agents, Month, Score1, Score2) df2 <-  df2$  Score1 <- as.numeric(as.character(df2$  Score1)) df2$  Score2 <- as.numeric(as.character(df2$  Score2))  Report <- df2 %>%             group_by(Month) %>%            summarise(Skill = mean(Score1), Attitude = mean(Score2)) 

I would like to loop through my agents, using each as a filter on the Report, and then save it as Report_agentname. I took a look at purr but can’t quite get my head around the map function and my needs here.

Generate thumbnails after csv import (Magento 2.3.1)

I imported a csv with only base_image. If I check the products after reindex and cache flush, I can see my products photos in frontend, but not in list/grid (they only show default “M” image).

Then I tried with

bin/magento catalog:image:resize as well as bin/magento setup:static-content:deploy -f

I can see images in pub/media/catalog/product but they are not being called.

Any ideas on how to generate / link properly?

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by: dewan180580
Created: —
Category: Traffic
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