Rebecca Heilweil
Фото: Наталья Селиверстова / РИА Новости
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The bats soon begin to emerge, darting and swooping up and down the aisles, the amplified sounds of their bat chatter filling the historic building.
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.