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Pick a battle-tested problem set — Blind 75, NeetCode 150, Grind 75 — and we walk you through every problem brute-force → optimal in Java and Python, with line-by-line explanations and interview coaching.
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Everything below is the same content, organised three ways. Choose how you want to work and jump straight to the right section — you can always switch later.
Pick a battle-tested checklist (Blind 75, NeetCode 150…) and work it end-to-end. The fastest route if you're short on time.
Go to Study PlansFollow the 18-module roadmap, phase by phase. Each module starts with theory, then problems — ordered by how interviewers actually test.
Go to the RoadmapJump into the full problem library or browse by topic. Filter by difficulty, module, or company to attack exactly what you need.
Go to Problems100 of the simplest, most-asked coding problems — reverse a string, find the max, FizzBuzz, check a prime — each explained step by step in Java and Python before you tackle Easy, Medium, and Hard.
Start here
Industry-standard problem sets, time-boxed for interview prep. Each one links straight into our line-by-line walkthroughs.
Structured preparation
18 modules across 4 phases · ~97h · ordered by how interviewers actually test.
Big-O analysis & recursion — mental models every pattern builds on
6 patterns that unlock ~60% of all interview problems — start here
Trees, Graphs, DP, Backtracking — hard-medium tier that separates candidates
Intervals, Bit tricks, Math, Tries — round out coverage before the loop
All problems
407 problems · 141 easy · 226 medium · 40 hard · filter by difficulty, module, or search.
What's covered
15 topics — each links to a theory page plus problems and solutions.
Common questions