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Under the new API design, transforms should not perform any work until the data is being consumed. This is a fundamental principle.
，这一点在服务器推荐中也有详细论述
Her appearance, described by one viewer as "camp and iconic", instantly went viral - spawning memes of the star's face screwed up in concentration, before pulling an answer out of thin air with a victorious swish of her hair.
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.
Любовь Ширижик (Старший редактор отдела «Силовые структуры»)