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.
savings account, where transactions were so infrequent that the bank recorded
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"So, I started just Googling bricks and it wasn't too many searches [before] I found the Brick Industry Association," says Squire.