（二）主动消除或者减轻违法后果的；
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.
。旺商聊官方下载对此有专业解读
while (bucket[i] 0) {
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