Structured DSA learning — not a random problem dump

Master DSA.
One concept at a time.

A structured path from programming fundamentals to technical interviews. Learn concepts in sequence, practice progressively, and prepare for real interview patterns used at Google, Amazon, Meta, and more.

First time here? You'll get a 5-step onboarding to personalize your journey.

15
Phases
18
Patterns
16
Companies
0%
Your Readiness

Everything you need to crack DSA interviews

One platform combining a course, an algorithm visualizer, a problem roadmap, a coding practice environment, and an interview prep system.

Sequential Roadmap

15 phases from foundations to advanced DSA. Always know what to learn next.

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Curated Problems

Progressively ordered problems with hints, explanations, and complexity analysis.

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Pattern Library

18 essential DSA patterns with templates and recognition clues.

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Mock Interviews

Simulate real interview pressure with timed problem sets.

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AI Tutor

Get explanations, hints, and Socratic guidance without spoiling solutions.

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Mastery Tracking

Spaced repetition, achievements, and an interview-readiness score.

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The structured learning journey

Sequential phases with progressive difficulty. Move forward only when you're ready.

Phase 0~10h

Programming Foundations

Minimum programming concepts required before DSA.

4 subtopics
Phase 1~25h

Arrays

The most fundamental data structure. Learn indexing, traversal, two pointers, sliding window, prefix sums and Kadane's algorithm.

7 subtopics
Phase 2~18h

Strings

String traversal, palindromes, anagrams, pattern matching, KMP, Rabin-Karp and Trie basics.

5 subtopics
Phase 3~15h

Linked Lists

Singly, doubly, circular lists. Reverse, cycle detection, fast & slow pointers, merge.

4 subtopics
Phase 4~12h

Stacks

LIFO structure, parentheses, monotonic stacks, next greater element, histogram.

3 subtopics
Phase 5~8h

Queues

FIFO, circular queue, deque, priority queue intro, queue using stacks, BFS connection.

3 subtopics
Phase 6~12h

Hashing

Hash maps, hash sets, frequency maps, two sum, prefix sum + hashing, subarray problems.

3 subtopics
Phase 7~12h

Recursion

Base case, recursive case, call stack, recursion tree, factorial, fibonacci, array/string recursion.

3 subtopics

A learning philosophy that works

The core principle: Learn the concept → understand it → implement it → solve easy → solve medium → solve pattern problems → solve interview problems → revise → move on.

  • Always know what to learn next
    A clear roadmap with unlock thresholds.
  • Never get stuck on random problems
    Curated problem ladders per subtopic.
  • Spaced repetition built-in
    Problems return at 1, 3, 7, 14, 30 days.
  • AI tutor, not a solution fountain
    Hints, Socratic guidance, debug support.
  • Interview readiness score
    Calculated from mastery, not just problem count.

A student's view

You are here → Arrays

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Learn indexing
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Solve 3 basic problems
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Learn traversal
4
Solve 3 problems
5
Learn prefix sums
6
Learn two pointers
7
Solve 8 problems
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Take mastery test