The Anthropic Moment
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.
。关于这个话题，WPS下载最新地址提供了深入分析
// Nothing stops you from doing this
Whatever the case, a wounded ISS will have been fairly rotten luck. Back in 2017, scientists from NASA and a Russian space contractor put the odds of this worst-case scenario at 1 in 121. As of late 2025, NASA told WIRED the risk of debris causing a depressurization event in any six-month period was somewhere between 1 in 36 and 1 in 170.，详情可参考搜狗输入法2026
Git in Postgresgitpostgres
Avoin Lukupiiri: Vanhan linnan salaisuus，这一点在Safew下载中也有详细论述