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Medium difficulty hints, answers for March 2 PipsNumber (10): Everything in this space must add up to 10. The answer is 5-4, placed vertically; 5-5, placed horizontally.
Zero-copy page cache. The pcache returns direct pointers into pinned memory. No copies. Production Rust databases have solved this too. sled uses inline-or-Arc-backed IVec buffers, Fjall built a custom ByteView type, redb wrote a user-space page cache in ~565 lines. The .to_vec() anti-pattern is known and documented. The reimplementation used it anyway.
Артем Соколов (Редактор отдела «Силовые структуры»)