The proud Welshman adds: "You owe us, America.
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，详情可参考同城约会
Фото: Nathan Howard / Reuters
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.