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DSA, without the overwhelm

Learn the concept. Solve the pattern. Move on.

A practical DSA roadmap for developers who want to become interview-ready without spending months grinding random problems.

Start the roadmapHow this works

Roadmap progress

27 problems across 3 published concepts

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01 Arrays

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Your progress

Checking your session…

01 — The Method

One concept at a time, and only as many problems as it takes.

01

Learn

Watch/read the concept and understand the underlying data structure or algorithm.

02

Practice

Solve a small set of carefully selected LeetCode problems.

03

Move On

Once the core pattern makes sense, continue. Come back later for revision.

Callout

You don’t need to solve 50 problems before learning the next concept.

02 — Roadmap

19 concepts, in order

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Understand how arrays work, how memory and indexing behave, and how to reason about basic array operations.

Before you start

Estimated learning time · 30–45 minPractice target · 8 problems
  • Understand static arrays
  • Understand dynamic arrays
  • Understand indexing
  • Understand traversal
  • Understand insertion and deletion
  • Understand basic time complexity
  • Understand in-place array modification
  • Recognize basic array traversal patterns

Why these problems

Eight problems that move from plain traversal through in-place writes and reverse passes to prefix/suffix reasoning. Each one adds exactly one new idea, so the set is short on purpose.

Solved— / 8

Practice these 8

— / 8 solved

1929Concatenation of ArrayEasy

Why this problem — Basic traversal and indexing

Open on LeetCode
1480Running Sum of 1d ArrayEasy

Why this problem — Iteration and maintaining state

Open on LeetCode
1470Shuffle the ArrayEasy

Why this problem — Index manipulation

1431Kids With the Greatest Number of CandiesEasy

Why this problem — Traversal and comparisons

27Remove ElementEasy

Why this problem — In-place array modification and read/write pointer reasoning

1299Replace Elements with Greatest Element on Right SideEasy

Why this problem — Reverse traversal and maintaining a running maximum

283Move ZeroesEasy

Why this problem — In-place modification and two-pointer/read-write reasoning

238Product of Array Except SelfMedium

Why this problem — Prefix/suffix reasoning and space optimization

03 — When should I move on?

Don’t wait until you can solve every problem.

Move to the next concept when you can:

Typical target8–12 problems per concept

Explain the core idea without looking at notes

Solve most Easy problems independently

Recognize the basic pattern

Explain your time and space complexity

Understand the solution to the problems you couldn't solve

04 — Your Study Session

A single problem, in about 45 minutes

15–25 min

Try the problem yourself

5–10 min

Study the solution if stuck

10 min

Close the solution and implement it yourself

2 min

Write down the pattern + complexity

Move on. Revisit later.

05 — Progress

Where you are

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01Arrays—/8
02Hashing—/11
03Two Pointers—/8
04Stack—/8
05Binary Search—/10
06Sliding Window—/10
07Linked List—/10
08Trees—/12
09Tries—/6
10Heap / Priority Queue—/8
11Backtracking—/10
12Graphs—/12
13Advanced Graphs—/8
141-D Dynamic Programming—/12
152-D Dynamic Programming—/10
16Greedy—/8
17Intervals—/6
18Math & Geometry—/8
19Bit Manipulation—/8

06 — Notes

The questions that come up on the way

1 note · more as they come up

Note7 min read

How do I know the time complexity?

Big-O isn't something you memorize — it's something you read off your own code. Loops, nesting, and the handful of patterns that cover most of what you'll write.

Read the note

07 — Why this roadmap?

Most DSA roadmaps optimize for the number of problems you complete.

This one optimizes for how quickly you recognize patterns.

Fewer, better-selected problems

Clear stopping points

Designed for developers with a full-time job