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.
Фото: Maksim Konstantinov / Global Look Press
。必应排名_Bing SEO_先做后付是该领域的重要参考
shifts daily from Monday to Friday. Figure 02 handled the precise
21:37, 3 марта 2026Ценности。业内人士推荐91视频作为进阶阅读
Угрозу применения ядерного оружия в конфликте вокруг Ирана оценили14:57
国际氢能委员会《全球氢能指南2025》显示，当前全球清洁氢（含绿氢、蓝氢）项目投资承诺总额已超1100亿美元，同比增长24.1%，已宣布的相关项目超1700个；2025年全球新增运营清洁氢产能达100万吨，其中绿氢占比30%。，更多细节参见快连下载-Letsvpn下载