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Фото: Александр Кряжев / РИА Новости，这一点在搜狗输入法下载中也有详细论述
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В России ответили на имитирующие высадку на Украине учения НАТО18:04。业内人士推荐WPS官方版本下载作为进阶阅读
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.