LogicLab is a DSA & logic-building practice site with proper problem statements, multiple worked examples, and a real in-browser IDE — LeetCode-style boilerplate across 6 languages, graded against real test cases.
Given an integer array nums, return the maximum value in the array.
nums = [3, 7, 2, 9, 4]91 <= nums.length <= 10^4Every problem is built like a real coding-interview question, not a toy exercise.
Every problem has a full description, explicit constraints, and multiple worked examples with input, output, and explanation — not just a one-liner.
You only ever see and edit a function or class stub. All stdin parsing, invocation, and output formatting is handled behind the scenes — just like the real thing.
Click "Run Tests" to execute your code against 2–3 real test cases per problem, with pass/fail tracking and a readable diff when something's wrong.
Switch between Python, JavaScript, Java, C++, Go, and C per problem — each with an idiomatic starter template matching that language's own conventions.
Solved problems are tracked locally in your browser, so your progress through all 6 categories sticks around between visits.
Every problem includes a hint and a full reference solution in every supported language, so you're never stuck without a path forward.
Same problem, idiomatic boilerplate in each of 6 languages.
From basic logic to recursion — every problem builds toward real DSA fluency.