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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，这一点在旺商聊官方下载中也有详细论述
arXivLabs: experimental projects with community collaborators
Москвичей предупредили о резком похолодании09:45