One rule of thumb Everstine has is that "if the price seems too good to be true, that should be a red flag". For instance, $3 for a bottle of olive oil or honey in the US might be suspect.
Point lookups are useful, but the operation you'll reach for more often is a range query: give the tree a rectangular region and retrieve every point inside it, without scanning the entire dataset.
，这一点在爱思助手下载最新版本中也有详细论述
for (int i = 0; i < n; i++) {
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