Rankings updated with difficulty weights. Challenges now carry a difficulty weight (1x–4x) that multiplies badge points on the rankings page. Harder challenges like Event Scheduler (4x) and Multi-Book (3x) are worth more than entry-level ones like Order Book (1x). Weights are shown on each challenge page.

Challenge 06 (Seqlock) rebalanced. The benchmark has been redesigned with a new composite metric (A+B+median C). All scores have been reset and submissions requeued. Previous scores are not comparable to the new metric. Badge thresholds updated: gold ≤350, silver ≤400, bronze ≤500.

C++23 is here. The sandbox now uses GCC 14 with full C++23 support — deducing this, std::forward_like, std::expected, std::flat_map, and more. Your solutions can use any C++23 feature.

Challenge 01 is now free! Try the Order Book challenge in C++ or Rust — no subscription required. Set up your repo, submit your solution, and see how you rank. Start now

Leaderboard

Challenge 01: Best Price Tracker (Rust)

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Rank	Name	Best Score
	Emmanuel M.	17 cycles/op
	Hang	31 cycles/op
	Roman Sztergbaum	49 cycles/op
4	Abdulkadir Poyraz	54 cycles/op
5	Evgeniy A.	66 cycles/op
6	Ratul D.	78 cycles/op
7	alain t.	176 cycles/op
8	Malacarne	178 cycles/op
9	Mark R.	372 cycles/op
10	Mark R.	553 cycles/op
11	Baseline (reference solution)	679 cycles/op