I shut down the L train in a graph: max flow, min cut and AI agents on the New York subway
Picture 8 a.m. on a Wednesday in October. A signal fire in the Canarsie Tube stops the L between Bedford Av and 8 Av, in both directions, until furt…
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Here's why I think this polynomial time SAT solver concept is correct
Algorithm concept I've been working on a polynomial-time SAT solver concept for over a year. Here are the reasons why I think this concept is correc…
Someone just starting out looking for feedback
Getting into coding just for fun. I've been working through lessons and Codecademy and this is my first project for development basics. This is the…
A(5) = 5: four matrices finish the case t = 5
This is from MV2's open notebook on Kakeya-type problems ( https://github.com/munimtechnologies/kakeya-small-fields ). It continues the earlier post…
Engineering a Multimodal Travel Planner on a 228,060-Edge Graph
A flight search engine answers a well-defined question: which available flights connect two airports? A door-to-door travel planner must answer a mo…
Cube translates in non-abelian groups: what commutativity is worth
This is from MV2's open notebook on Kakeya-type problems ( https://github.com/munimtechnologies/kakeya-small-fields ). An earlier post showed that a…
Как я решал leetcode задачу
Хочу поделиться личным опытом нестандартного решения одной конкретной задачи с leetcode на понимание backtracking алгоритма и немного порассуждать н…
Start and End Dates of the Longest Rising Period
Problem Description The stock table records the daily closing prices of many stocks, with the fields CODE (stock code), DT (trading date) and CL (cl…
2Sum in Constant Time?
Is it possible to solve the two_sum problem in constant time O(1) , I asked myself. Reading through Mr Wengrow's DSA book, I soon come to find out t…
Trie Data Structure: Efficient Prefix Matching and Autocomplete Implementation
Introduction When building features like search bar autocomplete, spell checkers, or IP routing tables, traditional hash maps and balanced binary se…
Why your topological sort gives a different answer on every run
You have a few tasks, and some of them depend on others. You put them in a graph, sort it topologically, and print the order. Then you run the progr…
How 913 Puzzles Became 7,304 Levels: Procedural Variation on a Precomputed Puzzle Bank
Meowdoku ships over a hundred levels and keeps growing. Every one of them has to be provably solvable. This is a Star Battle-style puzzle, so a malf…
Can Algorithms Track Behaviour? Monitoring Coordinated Online Actions
Online action detection is central to modern cybersecurity analysis. Simply tracking individual accounts provides only scattered data points; it doe…
Let the player build the maze - a 576-cell flow field for a tower defense map
Most tower defense maps give enemies a fixed lane. In one map of Void Parry 's tower-defense mode, "Null Grid", there is no lane at all: an open 32x…
base conversion
I write python code of a base conversion from any base system into other any base system, so I break down the code into some processes; base-B to ba…
ARM Matmul Continued: BFMMLA Edition
This is a continuation of my previous article on using ARM NEON to do matrix multiplication. Here's a fun one, we're going to use BFMMLA to do 2x4 @…
Implementing the Destiny Matrix in TypeScript: reducing a birth date to Major Arcana
The "Destiny Matrix" is a numerology-style system that went viral on social media: you enter a birth date and get a chart of numbers from 1 to 22, e…
SuperTrend Strategy Optimization: No Losing Year on Gold
Update, 21 Sep 2026. I put this result through a harder test after publishing, and the first optimized version below didn't survive it. The final, s…
Your RAG Searches by Meaning. But What About Exact Words? Meet BM25
Hello, I'm Rijul, and I'm building LiveReview — a blast-radius aware AI code review built for your business-critical systems. Star us to help devs d…
How Uber Computes Estimated Time of Arrival (ETA)
Short answer: how does Uber compute ETA? Uber snaps noisy GPS pings to the road network (map matching), finds candidate routes on a road graph, and…
How to Come Up With the Raft Consensus Algorithm Yourself
If someone asks you to explain Raft, you might hear a list of terms like: Leader election Terms RequestVote AppendEntries Log replication Commit ind…
2026 - Backend Interview Questions
1. Core Java & OOP Write an immutable class in Java Comparable vs Comparator with examples What is a Functional Interface? Can it have default a…
How a Word file becomes a printed book: line breaks, widows and the KDP gutter
Originally published at getnobody.org . A Word document has no pages, not really. It has paragraphs, and Word decides where the pages fall while you…
I Audited a C Graph Algorithm Project and Found 13 Bugs — Including an Auth Bypass That Was Hiding in Plain Sight
The project It's a campus tour guide system written in C. Console application, no GUI, no networking. A user logs in, picks from a menu, and queries…
My solver called this FreeCell deal trivial. A few careless moves kill it.
If your game generates its own levels (puzzles, boards, card deals), sooner or later you need to know which ones are easy. The obvious tool is the s…
Mastering Two Pointers: A Step-by-Step Guide to Solving Sequence Problems
Mastering Two Pointers: A Step-by-Step Guide to Solving Sequence Problems Two Pointers is an algorithmic pattern used to solve problems by tracking…
Big-O explained simply
When I first heard about Big-O it sounded intimidating, but it turned out to be a simple idea once I saw a few examples. Here's how it finally click…
Five results: I spent time proving splines don't help trajectory databases
If you work with GPS tracks, this idea shows up sooner or later: why store a trajectory as a polyline of thousands of points when a vehicle moves sm…
A real world case of recursion done right in PHP
Nick Cosentino @DevLeaderCa posted this message about recursion on X, ex Twitter, in October 2025, which received over 460 replies. // Detect dark t…
600 Terms, a Degree-14 Rational Generating Function, and a Limit Near π
I have been working on a deterministic operator called (EOA). It maps the spoken names of letters into integer sequences. For one English encoding,…