AlgoCards vs DATARAKU

Master coding interviews with 390 problems, company-specific prep lists, and spaced repetition — completely free. The only app with dedicated trading firm and quant interview prep. Practice the exact problems asked at Google, Meta, Amazon, Citadel, Jane Street, Two Sigma, Goldman Sachs, and 20+ more companies. WHAT'S INSIDE: - 390 curated problems with detailed Python solutions - Company-specific problem lists for 30+ companies - SM-2 spaced repetition for optimal review scheduling - Flashcard mode for on-the-go review - Algorithm pattern cheat sheets with code templates - Weakness detection that adapts to your performance COMPANY-SPECIFIC PREP: Filter problems by company and see what they actually ask. Coverage includes: Trading Firms: Citadel, Citadel Securities, Jane Street, Two Sigma, Jump Trading, Hudson River Trading, IMC, DE Shaw, SIG, Virtu, Point72, Millennium FAANG & Big Tech: Google, Meta, Amazon, Apple, Microsoft, Netflix, Uber, Airbnb, LinkedIn, Stripe, TikTok, Databricks, Nvidia, OpenAI, Palantir, and more ALGORITHM PATTERNS: - Arrays & Hashing - Two Pointers & Sliding Window - Binary Search - Stack & Queue - Linked Lists - Trees & Tries - Graphs & BFS/DFS - Dynamic Programming - Greedy - Heaps & Priority Queues - Backtracking SMART REVIEW SYSTEM: 1. Study problems in flashcard or detail mode 2. Rate your confidence after each problem 3. AlgoCards schedules your next review at the scientifically optimal interval 4. Weakness detection identifies your weak patterns and prioritizes them 5. Build lasting pattern recognition, not temporary memorization WHO IT'S FOR: - Software engineers prepping for FAANG and Big Tech - Quant developers targeting trading firms - CS students preparing for internship interviews - Career switchers learning algorithms and data structures 100% FREE. No paywall. No ads. No subscriptions. Every problem, every solution, every feature. Download AlgoCards and prep smarter.

An educational visualization app that lets you UNDERSTAND data structures by watching them - not by reading. Abstract concepts like stacks, queues, trees, and hash tables come alive as animations where the structure itself deforms in response to your operations. [ Basics - 4 structures ] - Stack (LIFO) - Feel "last in, first out" through stacking motion - Queue (FIFO) - Watch the entry and exit ends of a queue - Array - Visualize random access and the shifting of elements on insert / delete - Linked List - Nodes connected by arrows, rewired on insert and delete [ Advanced - 4 structures ] - Binary Search Tree - Values drop into place after branching left or right by comparison - Heap - Up-heap and down-heap motion in a complete binary tree - Hash Table - Keys travel through a hash function and land in a bucket - Graph - Nodes and edges showing adjacency [ Features ] - Every operation animates as a continuous deformation (no instant teleporting) - Operation log to review the meaning of each step - Each structure includes complexity notes (access / search / insert / delete), pros and cons, and real-world usage examples - Ads are never shown while an animation is playing - designed to preserve focus - Universal app for iPhone and iPad - Japanese and English (follows OS language) [ Who is this for ] - Students learning programming for the first time - Anyone preparing for IT exams - Engineers who want to re-grasp data structures visually - Curious minds who love watching things move [ Companion to ARURAKU ] The second information-systems title of the Raku Series, sibling to ARURAKU (algorithm visualization). The two apps cross-link, so the heap screen here links to ARURAKU's heap sort, and the graph screen here links to ARURAKU's BFS / DFS. Learn the "motion of computation" and the "structures that carry it" side by side. [ Note on pricing ] This app is completely free with no in-app purchases or subscriptions. To support development and maintenance we display Google AdMob banner and interstitial advertising. Ads are never shown while an animation is playing.