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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在理想模型中，如果一台机器人月均能接十单，每单两三千元，半年左右即可回本。这种测算足以让许多人产生强烈的参与冲动。