All challenges

Report hidden deposit coordinates from Manhattan-distance probe metadata.

Move a two-leg Manhattan compass among pinholes to collect value under equal-distance moves.

Optimize a CUDA/Triton implementation of the Mamba2 sequential scan recurrence.

Create binary magic words and identify ordered pairs from distinct-substring powers.

Type a string containing all lucky words while minimizing keyboard movement cost.

Output a long common subsequence of two strings.

Reorder CSV columns to improve prefix KV-cache hit rate.

Reorder CSV columns to improve prefix KV-cache hit rate.

Route offline LLM prompts to cheap, mid, or expensive model tiers for accuracy-cost tradeoffs.

Recover hidden integer lines from Frontier-CS source instances.

Recover a hidden limited-shuffle permutation using comparison queries.

Assign Boolean variables to satisfy as many three-literal clauses as possible.