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.
expensive as well, and still, in general, an unproven technology. Besides, the
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多年来，广东省退役军人事务厅大力宣传退役军人优势，且主动向企事业单位推介退役军人，强调其在执行力、团队协作、吃苦耐劳等方面的特质，改变社会认知。，更多细节参见谷歌浏览器下载
Владимир Седов (Редактор отдела «Силовые структуры»)
Российский телеведущий пожаловался на испражняющихся на улицах одной страны людей20:47