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.
Nigeria, Africa's most populous nation, is home to a large Christian population, particularly in the south of the country. The pilgrimages are widely regarded as being spiritually significant, with many saving for years to make the trip.
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По данным следствия, пес подозреваемого гулял без намордника в Нагатинском затоне и встретил бобра. Быстрая схватка двух млекопитающих закончилась победой собаки. Поскольку бобр занесен в Красную книгу столицы как редкий и уязвимый в условиях города вид, виновного привлекут к ответственности с обязательной выплатой ущерба, причиненного окружающей среде.
我看新闻里说，后来小黑板不够用了，工作人员又马上加了很多小黑板，还是写不完，这个对我的触动非常大。那些匆匆买东西、奔生活的人，把自己肚子里咽下去的那些玩笑和眼泪说出来了。一个小女孩当面跟她妈妈说“你早点下班”，和她把这句话写在小黑板上是完全不同的。她写这句话的时候，妈妈并不在场——这就是文学跟生活的区别。如果能把人们那些平常说不出来的话，引出来，这会成为我写作的一个很大的动力。。关于这个话题，下载安装 谷歌浏览器 开启极速安全的 上网之旅。提供了深入分析
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On Sunday 1 February, a yellow, blue and white Sudan Airways jet landed on the runway at Khartoum International Airport. As 160 passengers stepped off the aircraft, they cheered, hugged each other and took selfies. This was only the second commercial flight to arrive in the city since 2023 - a significant milestone given the continued threat of drone attacks in a country riven by civil war.。safew官方版本下载对此有专业解读