Algorithms & Data Structures

Two years ago I tried to arrange my bookshelf by height, shortest on the left. I had no plan. I just...

Documenting my daily LeetCode journey here! Today's Problem: 1512. Number of...

Intuition Manacher's Algorithm leverages the symmetry of palindromes to avoid redundant...

Every cloud service needs power. AWS has data centers, Azure has regions, GCP has zones — and they're...

The Quest Begins (The "Why") Honestly, I used to dread interview questions that started...

Minecraft terrain, roguelike dungeons, and No Man's Sky planets all come from the same place: rules,...

The Quest Begins (The "Why") I still remember the first time I faced a sorted array in an...

Problem Statement Given the root of a binary tree, return its preorder traversal. The...

I fell down this rabbit hole because of a small, annoying moment in a survival game. I had a diamond...

Searching for a pattern inside a string is one of the oldest and most common problems in Computer...

I avoided backtracking for an embarrassingly long time. I had solved maybe 200 problems and could do...

I recently came across the classic CPU Task Scheduler problem on HackerRank. You are given an...

The Quest Begins (The "Why") I still remember the first time I faced a coding interview...

How it actually works!

What each data structure in a coding interview screens for, the on-the-job behavior it predicts, and the signal your first sentences send.

Halo para developer kece! 👋 Pernah nggak sih lo ngerasa aplikasi yang udah susah payah lo bikin kok...

For six weeks I built things. Week 7 I solved problems. It's a different muscle. Building an app is...

A CLI that compresses text with Huffman coding and reports the ratio, in Go. The essence of Huffman...

The Quest Begins (The "Why") Honestly, I used to dread interview questions that asked for...

I keep falling into the same trap: coordinate calculations. I'm here to record some of the lessons...

Every one of us learned binary search the same way. We have a sorted array. Want to find a specific...

Problem Statement leetcode.com ...

Problem Statement Given items with value and weight, maximize total value inside a...

Most developers preparing for coding interviews learn the patterns. Sliding window. Two pointers....

A hands-on guide to one of the most powerful algorithmic patterns you'll use every week — with real...

In This Article The Question The Intuition Trap: Why Independent Strategies Fail The Loop Strategy:...

3. Longest Substring Without Repeating Characters 🟡 Medium Hey Dev.to fam! 👋 Today, we're...

Add Two Numbers 🟡 Medium: Summing Up Linked Lists Like a Pro! Hey there, aspiring algorithm...

N-Queens is a classic backtracking problem. The goal is simple: place N queens on an N×N chessboard...

TL;DR: The Blind 75 was a revolutionary resource when it was published, and it still has value today....

The first time a hash map stores more than existence — and the universal trick of tracking differences instead of comparing two separate things

I expected the 2026 World Cup bracket to be a sorting problem. It turned out to be a sorting problem...

Most BST tutorials teach search, insert, and delete as three procedures. You memorise one, then the...

A few months ago, I noticed I was rereading the same ByteByteGo article on rate limiting for the...

Every time you call .sort() in JavaScript, Python, or Java — Quick Sort is running under the...

Approach 1: Brute Force Try every possible buy day. For each buy day, try every sell day...

The textbook line on backtracking is "try everything and undo what doesn't work." Accurate, and...

You learn binary search trees and walk away believing every operation is O(log n). It isn't. That...

Many string problems look complicated because they involve: substrings repeated characters dynamic...

Bubble Sort isn't used in production — but it's the best algorithm to learn sorting logic because...

String interview questions often look tricky… But many of them are built on: character...

Given an array of integers and a target, return the indices of two numbers that add up to the target.

Longest Palindromic Substring: A Core String Algorithm Explained Welcome to another deep...

Unlock the Median Magic: Diving into Two Sorted Arrays! Hey LeetCoders and aspiring...

Most people learn sliding window and two pointers as two separate techniques, practice them in...

The complexity table for arrays and linked lists is the most memorised, least understood reference in...

Introduction This post covers binary heaps as a complete binary tree stored in an array,...

The Dutch National Flag Algorithm Dijkstra's Dutch National Flag algorithm sorts an array...