Kotlin · HackerRank-style algorithms
Classic HackerRank Problem Solving track ported to the arena workspace — array sums, string puzzles, grid searches, permutations, encoding tricks. Solve in Kotlin with stdin/stdout, verified server-side via Piston. 10–25 min each.
101 challenges14 topics
How it works1Pick a challenge2Read the requirements3Code in a full IDE4Run the tests
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101 challenges