人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用
"I have to walk two hours a day to come into town to get food," he says, preferring to find shelter outside of the city centre where he feels safer, sleeping in a one-man tent under a bridge.
，这一点在谷歌浏览器【最新下载地址】中也有详细论述
The dashed circle shows the current best distance. As the algorithm finds closer points, the circle shrinks, which causes more subtrees to fail the "could contain a closer point?" test and get pruned. The search usually gets cheaper as it progresses.
Платон Щукин (Редактор отдела «Экономика»)