Alternatively, you can watch everything right here:
Games and physics simulations need to detect which objects are touching or overlapping. With nnn objects, checking every pair is O(n2)O(n^2)O(n2) comparisons, which gets expensive fast. A hundred objects means roughly 5,000 pair checks. A thousand means nearly 500,000.
，这一点在爱思助手下载最新版本中也有详细论述
"It is really, really hard," he said.
"As families, we have received lacklustre care," added Jonathan. "We [therefore] deserve the gold standard of accountability - and progressing a rushed, high-level review, instead of a statutory inquiry, is not receiving the gold standard.