Hudson River Trading OA Experience: Two Trading-Style Coding Questions Breakdown
I recently completed the online assessment for Hudson River Trading (HRT) , and my biggest takeaway was this: the questions themselves were not imposs…
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Compile-Time Sorting in C++ With Templates: Why Heapsort Falls Apart
Tried implementing sorting algorithms as pure template metaprogramming. Not constexpr , not consteval . The old way, where the compiler does the sorti…
When Information Hits a Wall: Barriers in Cellular Automata
TL;DR: Add one frozen cell to a cellular automaton and watch the entire pattern reshape itself. This post explores what happens when you introduce a s…
Understanding Reversible Quantum Computation: Why Reversibility Matters in Quantum Computing
Understanding Reversible Quantum Computation: Why Reversibility Matters in Quantum Computing Introduction In the pursuit of more efficient and powerfu…
Word ladders the right way: BFS, bidirectional search, and why Dijkstra is overkill
Word ladders the right way: BFS, bidirectional search, and why Dijkstra is overkill If you’ve ever spent a lunch break procrastinating with a word l…
Spelling correction at scale: Levenshtein distance, BK-trees, and symmetric deletion
Spelling correction at scale: Levenshtein distance, BK-trees, and symmetric deletion If you’ve ever built a search feature, you’ve likely started …
Graph Algorithms for Coding Interviews: When to Use BFS, DFS, or Dijkstra
Graphs are the most feared topic in coding interviews — not because they're impossible, but because most people learn BFS, DFS, and Dijkstra in isolat…
I Taught a Browser to Play Piano — Here's How It Figures Out Which Finger Goes Where
Learning piano is hard enough without guessing which finger hits which key. Most sheet music doesn't bother telling you, and when it does, the fingeri…
Big O Notation explained
Introduction Big O notation measures how fast your code runs as the number of inputs grows. It’s really important to understand the following algorith…
How anagram solvers actually work: algorithms behind the scenes
How anagram solvers actually work: algorithms behind the scenes If you’ve ever built a word game or a tool to help with Scrabble, you’ve likely ru…
Fast and Slow Pointer Pattern: Cycles, Duplicates, Symmetry
Fast and Slow Pointer Pattern: How to Recognize It and Use It in Interviews AI changed the interview conversation, but it didn't kill technical assess…
Building a Saju Engine: Case Study with Karina's Birth Chart Algorithm
The Data Problem K-pop Poses to Backend Engineers Here's a fun engineering challenge that landed on my desk last year: how do you build a production-g…
Binary search is O(log n), but that's not the whole story
Everyone learns binary search as the textbook example of O(log n) efficiency. Halve the search space, halve it again, find your answer in logarithmic …
How to Find the Minimum Mirror Pair Distance in an Array
Have you ever encountered an algorithm problem where you need to find pairs of numbers that are "mirrors" (reversals) of each other? Recently, I was w…
Twin Primes Conjecture under Rei-AIOS Lens — A Structural Reinterpretation of Zhang-Maynard Bounded-Gap Results
This article is a re-publication of Rei-AIOS Paper 115 for the dev.to community. The canonical version with full reference list is in the permanent ar…
a claude code/codex plugin to run autoresearch on your repository
i built https://github.com/evo-hq/evo for those of you who are autoresearch pilled , or have been meaning to get into autoresearch but dont know how. …
Topological and Ergodic Approaches to the Collatz Conjecture: Rei-AIOS vs. Santana (2026)
Liquid syntax error: Variable '{{n, 2n}' was not properly terminated with regexp: /\}\}/
I built a tool that visualizes your code step by step — Recursive
Recursive is a open-source tool that lets you paste your code and watch it execute line by line. No setup, no breakpoints — just paste and run. Try it…
GN: Domain-Adaptive Lossless Compression for LLM Conversation Streams
PDF version: github.com/atomsrkuul/glasik-core/blob/master/GN_PAPER_V2.pdf Code: github.com/atomsrkuul/glasik-core (MIT) Robert Rider | Independent Re…
I Built a Compression Algorithm That Beats Gzip in 2 Weeks. I Have an A+ Cert.
How a networking student ended up writing Rust, beating industry-standard compression, and learning more about computers than any classroom taught me.…
How I Built an HFT Matching Engine (And All The Things I Got Wrong)
I'm a second-year CSE undergrad. A few months ago I decided to build a limit order book matching engine in C++, the kind that sits inside exchanges an…
No wall clock required: a 64-bit ID generator from a counter + reversible permutation
No wall clock required: a 64-bit ID generator from a counter + reversible permutation permid64 — Clock-free, persistent, reversible-permutation 64-bit…
Towards O(1) Computing: Minimizing System Entropy with Data-Centric High-Frequency Processing
Algorithmic Efficiency: The end of O(n) in data access In a data-centric environment, efficiency is not optional. The goal is to achieve constant comp…
The Art of Self-Mutating Malware
Article Summary : This article systematically elaborates on the technical evolution and implementation principles of self-mutating malware, covering t…
Choosing the Right Shortest Path Algorithm
Shortest path problems on LeetCode vary by constraint. Graphs can have weights, no weights, single source focuses, or all pairs requirements. Some hav…
Why Chunking Is the Biggest Mistake in RAG Systems
Retrieval-Augmented Generation (RAG) has become the default architecture for building AI-powered document intelligence systems. Most implementations f…
Говорящая лисичка, Айвенго и немного оптического потока
— Расскажи нам, папа, сказочку... — Ой, да когда мне вам рассказывать, у меня работы невпроворот. Послушайте лучше аудиокнижку. — Аудиокнижки скучные.…
From Futures to Runtimes: How Async Rust Actually Works
Introduction to Asynchronous Programming In synchronous programming, tasks execute linearly one after another on a single thread. fn synchronous () { …
A Strange Permutation Substring Sequence: Introducing OEIS A359012
I’ve been exploring a new integer sequence on the OEIS, A359012, and turned it into a small experiment in “data‑driven number theory”. This post brief…