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Search - "binary"
Holy. Fucking. Shit.
++111111110 on devrant. This is my moment to shine, my account completely blew up. I am the Elon Musk of devrant. I am the coolest bitch on this website, bow before me you peasants!
... wait, is this binary?7
Me talking to a recruiter (even though I am not looking for a job)
Me: If I walk into an interview, and they ask me to reverse a binary tree for a frontend Reac or Vue position or something along those lines, I will end the call and/or walk away from it.
Him: I get similar feelings from other programmers, I don't quite understand why the notion is as common
Me: Because it is fucking useless, it servers no purpose to a dev to know about that when building frontends with react, I link my github profile, for which they can find advanced backend-frontend related projects, compiler and interpreter projects, plus the title I currently have at my workplace and a bunch of other shit, I am not interviewing for a teaching position at an institute, but an actual place of work, for which if they want to know about DS and A they can review my profile which has a repo of DS and A in about 5 different languages including plain C++. I do not need to be offended by such notions since they server no purpose on the frontend, and neither do other devs. If anything it should be a casual conversation during the interview, not a basis for employment.
Recruiter: .........thank you for explaining this to me, I am sure I can bring it up to the agencies doing the reviews and interviews. Are you still interested?
Me: Are they going to give me a coding assignment for a project or a bs question like what I mentioned?
Him: I don't know
Me: then I am not interested12
Software is such an awe inspiring concept if you really think about it. We literally create our own reality from scratch. Binary for the wrong architecture? Don't worry we can emulate it. Network? Fully software defined. Heck, the servers don't even know if it's real or all in software. You know what? Fuck it! The machine isn't real either! All virtualized or software emulated
I'm really bad at putting things into words but the idea of software truly amazes me6
Well one thing that became obvious today is that companies that make wifi routers really dont want you flashing other firmware on it.
For example i got a new router cause it was time.
Ofc fully compatible with OpenWRT. The thing tho ? The GUI flashing process accepts only encrypted binaries. And surprise we as customers cant encrypt it like they do.
So the next thing that comes to mind instantly is UART. They cant break that right ? Well turns out they can. They just disallow key inputs from console. So you cant make the damn device load into TFTP mode.
And D-Link has this lovely recovery utility that accepts unencrypted firmware. EZ way to flash it right ? WRONG. The garbage doesnt load second time after you load it once in 1 boot. And even if you get it to start loading the firmware. It wont really flash it.
Luckily there was an exploit :)
And joining via telnet and enabling http server on PC and wget-ting the binary from there. And flashing.
Honestly now. I pay money for this garbage. I own the hardware. Let me do what i want with it.
At least it runs kernel 5.10 now and is super fast :) Worth the trouble honestly
(Should be noted im not new to flashing firmware on routers. But this is the first one that really didnt want me to flash it. Like nuking my freaking UART access ? Taking it too fucking far)7
4 hours! four fucking hours! f.o.u.r. h.o.u.r.s.!
It's the amount in the time domain this bug has cost me to fix. The cost in the sanity domain is immeasurable...
I swear, the god damn ass births of devs who coded this abomination should be slowly mutilated and then raped by their own severed limbs.
It took me 4 hours to figure out that their 12 year old binary CLI tool they used to generate PDFs from PHP could not handle neither HTML5 nor some linebreaks at specific places. Some part of it is due to them using REGEX to find and replace HTML tag.
Yes, I am indeed very pissed. And I need a 🥃 or 3
What we learned:
- Don't use REGEX to "parse" HTML
- Don't call random compiled CLI tools from PHP if there are PHP packages to do the same shit9
PM is such a fucking cunt
telling me that my data structures describing the layout of binary data would be confusing for devs, and that we shall introduce
typedef fuckingRetardedObfuscatingName uint8_t;
in our code. everyone is fine with the concepts i provide to describe this binary data, not only at our company but also in other software i've worked on and common standards i've worked with, we work like that and every fucking idiot knows what a uin8_t is.
you fucking braindead imbecile have no fucking idea how we work and you don't care, you don't even try to understand what we are doing.
god i hope you die being hit by a fucking bus or something8
Is this a bad way to traverse corners of a cube?
The objective is obvious from the context and I assume that programmers know how binary works.10
Recently I launched the minimalistic online drawing app https://okso.app. I wanted it to be a place where people could do fast, ad-hoc, napkin-based-like explanations of any concept as if you are sitting with your friend and trying to explain him/her something during lunch. Don't ask me why it is needed, I was just experimenting.
So, the first concept I've tried to explain with sketches was the Data Structures. Without further ado, here is the interactive ✍🏻 https://okso.app/showcase/... showcase that you may play with.
Of course, not all data structures are covered. And of course, this is not comprehensive material, but rather a cheatsheet that would create visual hints and associations for the following data structures:
- Linked List
- Doubly Linked List
- Hash Table (with hash collision resolution)
- Tree (including the Binary Search Tree)
- Heap (including Mean Heap and Max Heap)
Each box on the sketch is clickable, so you may dig into the data structure you're interested. For example `Heap → Max Heap`, or `Heap → Min Heap`, or `Heap → Array Representation`.
The sketches are split into so-called Pages just to make it easier to grasp them, so the users stay focused on one concept at a time, they see the relationship between the concept, and thus, hopefully, they are not getting overwhelmed with seeing a lot of information at the same time on one drawing/page.
The full list you may find in the ✍🏻 https://okso.app/showcase/... showcase.
I hope you find this showcase useful and I hope it will be a good visual cheatsheet-like complement to your data structure knowledge.12
Is the way people solve problems intrinsic to the native language they learned growing up? Can the shape of our thoughts be optimal for solving certain kinds of problems? Like sentence structure, grammar, etc.
If the pattern of thoughts a language promotes can help us solve problems. Then is there a spoken language that can help promote solving computer science problems?
I know I have to work to think differently to program in different styles of programming. I wonder if we can learn from different spoken languages patterns of logic that are applicable to engineering.
Mathematics, while not a spoken language, has helped me re-frame things in programming. I think programming has also helped in other areas. Like using binary search to find the end of a pipe in the ground.7
Disclaimer: I hold no grudges or prejudices toward [CENSORED] company. I love the concept of the business model and the perks they pay their employees. Unfortunately, the company is very petty, and negligence is the core of the management. I got into an interview for the position, of Senior Software Engineer, and the interview wouldn't take place if wasn't for me to follow up with the person in charge countless times a day. The Vice President of Engineering was the most confused person ever encountered. Instead of asking challenging questions that plausibly could explain and portray how well I can manage a team, the methodology of working with various technology, and my problem-solving skills. They asked me questions that possibly indicated they don't even know what they need or questions that can easily get from a Google Search. I was given 40 hours to build a demo application whereby I had to send them a copy of the source code and the binary file. The person who contacted me don't even bother with what I told her that it is not a good practice to place the binary in cloud storage (Google Drive, OneDrive, etc) and I request extra time to complete the demo application. Since I got the requirement to hand them the repository of the codebase, it is common practice to place the binary in the release section in the Git Platform (Jire, Azure DevOps, Github, Gitlab, etc). Which he surprisingly doesn't know what that is. There's the API key I place locally in .env hidden from the codebase (it's not good practice to place credentials in the codebase), I got a request that not only subscript to an API is necessary but I have to place them in the codebase. I succeed to pass the source code on time with the quality of 40 hours, I told him that I could have done it better, clearer and cleaner if I was given more grace of time. (Because they are not the only company asking me to write a demo application prior to the assessment. Extra grace was I needed)
So long story short, I asked him how is it working in a [CENSORED] company during my turn to ask questions. I got told that the "environment is friendly, diverse". But with utmost curiosity, I contacted several former employees (Software Engineer) on LinkedIn, and I got told that the company has high turnover, despises diversity the nepotism is intense. Most of the favours are done based on how well you create an illusion of you working for them and being close to the upper management. I request shreds of evidence from those former employees to substantiate what they told me. Seeing the pieces of evidence of how they manage the projects, their method of communication, and how biased the upper management actually is led me to withdraw from continuing my application. Honestly, I wouldn't want to work for a company where the majority can't communicate.
In the 90s most people had touched grass, but few touched a computer.
In the 2090s most people will have touched a computer, but not grass.
But at least we'll have fully sentient dildos armed with laser guns to mildly stimulate our mandatory attached cyber-clits, or alternatively annihilate thought criminals.
In other news my prime generator has exhaustively been checked against, all primes from 5 to 1 million. I used miller-rabin with k=40 to confirm the results.
The set the generator creates is the join of the quasi-lucas carmichael numbers, the carmichael numbers, and the primes. So after I generated a number I just had to treat those numbers as 'pollutants' and filter them out, which was dead simple.
Whats left after filtering, is strictly the primes.
I also tested it randomly on 50-55 bit primes, and it always returned true, but that range hasn't been fully tested so far because it takes 9-12 seconds per number at that point.
I was expecting maybe a few failures by my generator. So what I did was I wrote a function, genMillerTest(), and all it does is take some number n, returns the next prime after it (using my functions nextPrime() and isPrime()), and then tests it against miller-rabin. If miller returns false, then I add the result to a list. And then I check *those* results by hand (because miller can occasionally return false positives, though I'm not familiar enough with the math to know how often).
Well, imagine my surprise when I had zero false positives.
Which means either my code is generating the same exact set as miller (under some very large value of n), or the chance of miller (at k=40 tests) returning a false positive is vanishingly small.
My next steps should be to parallelize the checking process, and set up my other desktop to run those tests continuously.
Concurrently I should work on figuring out why my slowest primality tests (theres six of them, though I think I can eliminate two) are so slow and if I can better estimate or derive a pattern that allows faster results by better initialization of the variables used by these tests.
I already wrote some cases to output which tests most frequently succeeded (if any of them pass, then the number isn't prime), and therefore could cut short the primality test of a number. I rewrote the function to put those tests in order from most likely to least likely.
I'm also thinking that there may be some clues for faster computation in other bases, or perhaps in binary, or inspecting the patterns of values in the natural logs of non-primes versus primes. Or even looking into the *execution* time of numbers that successfully pass as prime versus ones that don't. Theres a bevy of possible approaches.
The entire process for the first 1_000_000 numbers, ran 1621.28 seconds, or just shy of a tenth of a second per test but I'm sure thats biased toward the head of the list.
If theres any other approach or ideas I may be overlooking, I wouldn't know where to begin.16
The new end to the idiotic code snippet head scratchers interviews (awkward for both parties but nobody is willing to admit it)?
Infinite internet access, use whatever tools you want, do as much as you can in 2-3 hours.
The best non-toxic way to see how someone works as a dev.
This is the way I expect you to work, so this is the way I will interview you.
Sorry silicon valley, we don't need people who can write up a binary search algo from rote memory.3
Yo I heard you like compiling C/Cpp so we make you compile and link each individual file so you need a makefile for compiling everything. But that shit still gets to annoying to maintain so you make the make files with cmake. Just so you can compile a library basically at all.
And dont get me started on autoconf and random configure scripts you have to run before you actually configure shit.
Can we make compiling a regualr program any more difficult so that we need a whole ass A4 page of documentation just to end up with a binary of something?15
Oh look I'm posting the same thing again because all logical patheways lead to the same fucking place.
Sort of binary tree with a few keys added visualized.7
So I see posts about an interview question/challenge of inverting a binary tree. I don't use trees very often (mainly file related or parsing server nodes), but I thought I would learn how to do this.
I saw a page that started talking about different ways to invert enough to understand that one type of inversion is swapping left and right nodes. So I stopped before they showed how.
Then I created a test program that has a tree structure and also can display a tree before and after modification. This was kind of fun.
So then I wrote the inversion function. It was less than 10 lines of code. Wtf? I thought it would be harder than this.
Then I started wondering where trees were used. So today I have been learning how they are used and why I might need one to solve a problem. One use I intuited was parsing regex or a language. Apparently it is useful there.
What I am learning is that a lot of these interview questions are really test to see if you can comprehend instructions when stressed. Or you will ask questions to clarify the task. It doesn't necessarily test your ability to solve hard problems.
One thing that perplexes me. If inverting a tree is swapping nodes left<->right, then why not leave data in place and just swap roles in the functions. Maybe I completely misunderstood what inversion means or why it would be done. I guess if this is not inverting I have the structure to try other methods now.2
Already starting to regret trying to learn c++ AND test driven development at the same time. Do you think i can even get the boost-test headers located anywhere from a binary package installation.
3 days on no learning code cause i cant even get the testing suite up and verified.2
*looks drowsy* Ugh my head..
You know what, guys? If you can freshly and directly remember how to do this:
- calculate the time complexity for each type of loop and code structure
- knowing how to write the following regex:
"A 15-digit number starting with a possibility of a group of 1-2 digit numbers, segregated into three 5-digit numbers tuples with three different separator characters, evaluated ahead"
- mentally work out how to reverse an array's indexes (swapping algorithm) without writing anything down
- know how to optimize a binary search in your head
then kudos to you. lmao
I'm rusty. It took me a while..7
Okay, lemme be honest today...
So, I don't know HOW TO CODE IN BINARY.
Looking for some tutorial on Binary coding.
I hate systemd, i hate it. Which idiot wrote that piece of crap? And it isn't that easy to replace it when it is so embedded in the distro.
Its commands can't even output text normally, which should the absolute basic functionality of every program. And it does things automatically i didn't tell it to do, for example setting the system time to some random date instead of leaving it at 1970-01-01.
this moment when you write something to sync a 5 figure amount of entities from somewhere and halfway through a wild "sql exception: binary data truncated" weirdo occures because you where too lazy to adjust column constraints properly :-|3
Python.... Apparently Python maintainers now want their users to compile Python from source. What the hell? Where are the binary builds??
having a DSA interview in 2 days, any suggestions on how/what to prepare?
its been years since i tried solving coding problems with anything apart from strings or arrays( and that too the one we use in dev, like writing a function to convert string to uppercase, that's all i remember)
There are a million algorithms: knapsac, djikstra, DFS BFS, bellman ford, TRIE, BST, quick sort, merge sort, insertion , binary search... these are some buzz words i could remember from my early college days, 6 years ago. I was able to understand and learn them at that time, but now i know shit about them :/
How to go with all of these in 48 hours?6
There are 10 types of people in this world: those who understand binary, and those who don't.
copied from https://entechts.com/blog/2019/...3
What's your idea of a perfect number?
default decimal, prefix for binary, octal, hex
Integers in natural notation with strictly positive exponent
All bases allow natural notation, where the exponent is always a decimal number and represents the power of the base (0b101e3 = 0b101000)
Floats in all bases allow a combination of natural notation and dot notation
Underscores allowed anywhere except the beginning and end for easier reading11