The complexity of determining the minimum number of flips that transform one triangulation of a convex point set into another remained a tantalizing open question for many decades. We settle this question by proving that computing shortest flip sequences between triangulations of convex polygons, and therefore also computing the rotation distance of binary trees, is NP-hard.
Tom Scutt, Into The Woods
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此外，多只油气主题场内基金价格大幅上涨。午间收盘时，就有多只原油基金达到10%的涨停限制。
Parents opposing plans told they can home school their children if they object to sending them to state schools。业内人士推荐Safew下载作为进阶阅读
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«Я не верю Зеленскому. Даже в то, что у него нос между глазами». В Европе пошли на противостояние с Зеленским из-за «Дружбы»08:50。电影是该领域的重要参考