来源：阿里研究院：《“银发+AI”应用 趋势报告》
Notice how the highlighted region shrinks at each step. The algorithm never examines points outside the narrowing window. In a balanced tree with nnn points, this takes about log4(n)\log_4(n)log4(n) steps. For a million points, that's roughly 10 steps instead of a million comparisons.
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The full technical report is at REPORT.md in the repo, with per-font detail, appendices, and the complete top/bottom 30 lists. Every number in this post is reproducible from the commands above on macOS with the same system fonts.