September 2025: I added the Dreame Aqua10 Ultra Roller as the best robot vacuum for pet hair on carpet and shifted the Roborock Saros 10R (previously named the best robot vacuum overall) to the best robot vacuum for pet hair on hard floors.
1. 前置环境要求 (Prerequisites)
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The algorithm also visits children in order of distance to the query point. This means it checks the most promising quadrants first, which tends to find a good candidate early and enables aggressive pruning of the remaining quadrants. Without this ordering, the algorithm would still produce the correct result, but it would prune fewer nodes.
2025 年度，共有5915 家企业披露研发投入合计2.71 万亿元。其中，排名前100 企业（TOP100）的研发投入总计1.43 万亿元，较上年提升5.15%，头部效应更加明显；TOP100 企业研发占比（52.77%）也略高于上年（52.31%），资源集中度进一步提高。