Range queries ask "what's inside this box?" But sometimes the question is "what's nearest to this location?" This is the nearest neighbor problem, and you don't know how big your search radius should be. The nearest point might be right next to you or far away.
* 时间O(n) 空间O(n)（理论最优，无冗余计算），详情可参考搜狗输入法2026
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Rank-3 factorization, shared-A tied-KV, RMSNorm, grokking
June 2025: I replaced the Shark Matrix RV2300S with the 3i G10+ as the best budget robot vacuum for pet hair. While the Shark was a solid budget cleaner when it first came out, its suction power isn't nearly as strong as the 18,500 Pa of the 3i G10+. The 3i G10+ also has small obstacle avoidance and a pet camera.