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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.
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以携程为代表的头部平台,其战略重心已清晰地从追求自身GMV(商品交易总额)的线性增长,转向驱动全产业链的价值重塑。
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海拔高、填方边坡高、地质复杂……恶劣条件下,开展特高压站工程建设,是一个世界级难题。,推荐阅读51吃瓜获取更多信息
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