晚上11点多，他才回来。一进门，他就笑嘻嘻地说今天很开心。他说大家都见到了，几个兄弟轮着敬酒。有人说“这么多年第一次凑齐”，有人说“以后多走动”。
Restore to a checkpoint
。safew官方下载是该领域的重要参考
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.
原文来自:http://blog.daimajiangxin.com.cn
if (n <= 1) return;