All challenges

Add grid points by drawing valid axis-aligned or diagonal rectangles.

Pack bounded axis-aligned rectangles into a bin to maximize profit.

Place many grid points while avoiding the four corners of every axis-aligned rectangle.

Give closed trail walks for ranger teams so every trail is inspected with balanced load.

Choose a subset whose sum is as close as possible to a target.

Optimize ragged CUDA attention with per-row length masks.

Optimize packed INT4 quantized dot products on CUDA.

Choose bounded quadratic witnesses that cover high-weight modular residue queries.

Optimize QK RMSNorm on CUDA tensors.

Swap adjacent balls in a triangular pyramid to improve ordering.

Write a compact Push-Pop program that halts after exactly the requested odd number of steps.

Install subtree retuners on a rooted tree to improve prime-residue observatory coverage.