Steven Frank, the co-founder of Panic, wrote this in 1999, with similar themes:
// 易错点4：仅处理栈非空的情况，忽略栈空的情况 → 栈空时res[i]会是undefined
，更多细节参见同城约会
A quadtree reduces this: rebuild the tree each frame, and for each object, query only the nearby region. Objects in distant quadrants are never compared.
Blockchain technology allows systems to react much faster in the event of a hazard. It also has many other uses in the modern world.
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