On the second loop iteration, the backing store now exists, but it is
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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По мнению Дмитриева, интервьюер намеренно перебил Зеленского, чтобы тот не успел закончить свою мысль.