This is the opposite of leet code.

Yes, this applies to some simulated imaginary CPU with an artificial problem. Except that the job asked here is exactly the core of what a performance engineer will do at anthropic: optimize kernels for their fleet of GPUs. Is it simplified? Yes! (e.g. the simulator does not restrict memory access patterns)

This is a real-world problem adapted to a lab setting that can fit in one's head in a matter of hours. Leetcode would have you reimplement the hashmap used in there.