#Unisala universe
Our newsfeed was taking 4 seconds to load a feed. We added a cache. Now it takes 40 milliseconds.Here's what happened.The ProblemWe ran a load test with just 50
This thread is about auto Generating Semantic role based access control middleware using Metaprogramming.Metaprogramming is code that writes or manipulate
We cut our API latency by 67% and boosted throughput by 31%. We didn't change a single line of business logic. We didn't upgrade our servers. We fixed one stupi
Two Sum Add Two Numbers Longest Substring Without Repeating Characters Median of Two Sorted Arrays Longest Palindromic Substring String to Integer (atoi) Palind
Two Sum Longest Substring Without Repeating Characters Best Time to Buy and Sell Stock LRU Cache Number of Islands Reorganize String Trapping Rain Water Group A
Text Justification Word Search Number of Islands Word Search II Basic Calculator Kth Smallest Element in a BST Number of Islands II Top K Frequent Elements Eval
Two Sum Merge Strings Alternately Palindrome Number Trapping Rain Water Median of Two Sorted Arrays Longest Substring Without Repeating Characters 3Sum Merge So
🧱 1. Basic Functionfunction feature(){ return "hi" } console.log(feature()) => "hi" Everything here runs top to bottom, line by line, without interrup
Diameter of Binary TreeSimplify PathMerge Sorted ArrayValid PalindromeLRU CacheFind Peak ElementValid Palindrome IIDot Product of Two Sparse VectorsKth Largest
When a project starts, life is simple. You know how things are wired, and adding a new feature feels effortless. But as the system grows, that mental model coll
First thing first what's difference between Design Principles vs Design Patterns?The Why?Design Principles are broad guidelines or philosophies for writing good
The Situation & Challenge:At Blueflite, drone operations platform serves multiple organizations with straightforward roles:Operators : Plan and execute ope
Granular breakdown by subtechnique, focusing on patterns relevant to Amazon🧠 Greedy SubpatternsGreedy for Local Min/Max122. Best Time to Buy and Sell Stock IIG
Two SumBest Time to Buy and Sell StockLRU CacheMaximum Frequency After Subarray OperationNumber of IslandsReorganize StringLongest Palindromic SubstringMaximize
Trapping Rain WaterMerge k Sorted ListsCandyMedian of Two Sorted ArraysMinimum Window SubstringBasic CalculatorLFU CacheConcatenated WordsReverse Nodes in k-Gro
LRU CacheMaximum Frequency After Subarray OperationNumber of IslandsReorganize StringLongest Palindromic SubstringMaximize Y‑Sum by Picking a Triplet of Distinc
Two Sum – HashMapBest Time to Buy and Sell Stock – ArraysReverse Linked List – Linked ListValid Parentheses – StackPalindrome Number – Math/StringFlood Fill – D
A transformation sequence from word beginWord to word endWord using a dictionary wordList is a sequence of words be
Many struggle with backtracking because they confuse two fundamental patterns i.e Sequential Decision Making and Choice Generation. The Conversion Funnel: From
🎯 The Real Question: How do I train my brain to see patterns?here's the actual thinking process that happens in senior developers' minds:📖 STEP 1: R
EasyDesign Parking System (87.1%)Make Array Zero by Subtracting Equal Amounts (73.3%)Maximum Units on a Truck (74.3%)MediumLRU Cache (45.2%)Number of Islands (6
1/ Why System Design? I realized that while DSA builds problem-solving skills, System Design teaches how real-world software works:ScalabilityReliabilityPerfor
Publish-Subscribe is a messaging pattern where:Publishers send messages without knowing who receives them.Subscribers listen without kn
High Frequency Problems (Sorted by Frequency)https://unisala.com/llm/conversation/87DITfU?leafId=3676cfa1-37c8-4168-8211-df0cd93d07d7🟢 Easy Problems202. Happy
If you’ve ever built a search bar or input form that sends API calls, you’ve probably heard of debounce. Or maybe you’ve created a backend API then you've proba
