[System Design] Ride-Hailing Dispatch Algorithm: How Uber DISCO & Grab DispatchGym Match Drivers
Every time you tap "Book Ride," a system makes dozens of decisions in under two seconds: Which driver? What route? What's the real ETA? This article b…
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Surprise Over Age of Fundamental Algorithms: Modern AI Excluded from Standard University Courses
Introduction: The Timeless Nature of Algorithms When you crack open a standard Data Structures and Algorithms textbook, it’s easy to assume the conten…
Sliding Window: The Force Awakens – Detect the Pattern and Never Get Stuck Again
The Quest Begins (The “Why”) I still remember the first time I faced a “minimum size subarray sum” question in an interview. The problem stared back a…
Max Consecutive Ones
Problem Statement Given a binary array nums , return the maximum number of consecutive 1's present in the array. Example Input: nums = [1,1,0,1,1,1] O…
Remove Duplicates from Sorted Array
Problem Statement Given a sorted integer array nums , remove the duplicates in-place such that each unique element appears only once. Return the numbe…
Ray Tracing
Honestly, the way dedicated hardware and software engineering have teamed up has totally changed the game for developers making worlds look real. Inst…
🚀 BFS: The Jedi Mind Trick for Graph Traversal (Why It’s More Than Just a Queue)
The Quest Begins (The “Why”) I still remember the first time I stared at a whiteboard interview question that asked for the shortest number of moves a…
Why You Keep Failing Dynamic Programming Problems (And How to Actually Fix It)
TL;DR: Dynamic programming is the topic most developers struggle with longest, and the reason is almost always the same: they are trying to memorize s…
Three decisions behind a music-to-curator matching score
I build OTONAMI , a pitch platform that connects independent artists with music curators — playlist editors, radio DJs, bloggers, label scouts. At its…
Linked List Cycle II
leetcode.com Problem Statement Given the head of a linked list, return the node where the cycle begins. If there is no cycle, return null . You are no…
Palindrome Linked List
leetcode.com Problem Statement Given the head of a singly linked list, return true if the linked list is a palindrome and false otherwise. Example 1 I…
The Math Behind O(log n): Binary Search, log , and Why Halving Wins
You have read O(log n) a hundred times. Binary search is O(log n) . A balanced BST lookup is O(log n) . Heap insert is O(log n) . We nod along — log n…
How QR Code Logo Embedding Works (Without Breaking Scannability)
You've seen QR codes with logos in the center. Maybe a Starbucks QR with their siren, or a brand's QR with their logo stamped dead center. How does th…
Reverse Nodes in K-Group
leetcode.com Among all Linked List problems, Reverse Nodes in K-Group is one of the most challenging and interview-favorite questions because it combi…
Linked List Cycle Detection
leetcode.com Cycle detection is one of the most classic Linked List interview problems. At first, it may look like we need extra memory to track visit…
I Got Bored of LeetCode, so I Built a Coding RPG
https://dsa-life-simulator-frontend.vercel.app"I made a free tool to make DSA practice feel like an RPG — would like feedback from this community"Been…
How Constraints Changed the Way I Think About Algorithms
Over the past couple of years, I've spent a lot of time preparing for software engineering interviews. Like many developers, I started my Data Structu…
Delete Node in a Linked List
Problem Link - https://leetcode.com/problems/delete-node-in-a-linked-list/ This is one of those interview questions that looks impossible at first. No…
Hashing in Distributed Systems: A Complete Guide to Algorithms, Best Practices, and Real-World Applications
Have you ever wondered how Discord keeps your channel messages available even when a server goes down? Or how Amazon DynamoDB serves petabytes of data…
Reverse Pairs
Given an integer array nums , return the number of reverse pairs. A reverse pair is defined as: i < j && nums [ i ] > 2 * nums [ j ] Bru…
A Practical Guide to the ROS Navigation Stack: Core Components & Tuning
With rapid advances in robotics, autonomous navigation has become essential for mobile robots. The ROS Navigation Stack is the de facto open-source fr…
Segment Trees: The “Divide‑and‑Conquer” Trick That Actually Makes Sense
Segment Trees: The “Divide‑and‑Conquer” Trick That Actually Makes Sense Quick context (why you're writing this) I remember the first time I saw a segm…
DSA vs. Real-World Coding Interviews — and Where Does AI Leave Us?
For a long time, I have come across the debate on the right way to vet technical candidates: should interviews focus on Data Structures & Algorith…
I Have made multi state RGB QR code
An experimental color-based QR-like encoding system using multistate RGB modules for higher-density visual data storage. Yasovardan-Ram (Yasovardan Ra…
Sort Colors (Dutch National Flag Algorithm)
Given an array containing only 0 , 1 , and 2 , sort it in-place so that all 0s come first, followed by 1s , and then 2s . Example: Input: [2,0,2,1,1,0…
Markov Chain Coin Sequence: E[HH] vs E[HTH] Explained
In This Article The Question The Intuition Trap Building the State Machine for HH Solving the System: E[HH] = 6 Building the State Machine for HTH Sol…
Why I Stop Sorting and Start Heaping: A Practical Guide to Priority Queues
Why I Stop Sorting and Start Heaping: A Practical Guide to Priority Queues Quick context (why you're writing this) I was grinding through LeetCode’s “…
Top 5 Data Visualizations for Algorithmic Trading (With Python Code)
Top 5 Data Visualizations for Algorithmic Trading (With Python Code) Most algo traders write signals. Almost none visualize them correctly. You can ha…
BFS vs DFS — Same Graph, Why Such Different Paths? Visualized in React
BFS and DFS show up in every technical interview. Most developers know the names but get confused explaining the difference. Until you see them run on…
2487. Remove Nodes From Linked List
In this post i'm gone explain liked list an famous leetcode problem that is " Remove Nodes from linked list ". Problem Statement: You are given the he…