Жители Санкт-Петербурга устроили «крысогон»17:52
// We've been tampered with. Refuse to play.
，这一点在同城约会中也有详细论述
only in cases where the guess is small:
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.