// 易错点3：处理最终结果为空的场景（比如num="10"，k=2）
2026-02-26 11:00:00
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An Ars Technica colleague recently bought a new M4 MacBook Air. I have essentially nothing bad to say about this hardware, except to point out that even in our current memory shortage apocalypse, Apple is still charging higher-than-market-rates for RAM and SSD upgrades. Still, most people buying this laptop will have a perfectly nice time with it.
"In hindsight, we should have provided more detail about our intentions and how the process works."