AI First有问题先问 AI，有需求也先提给 AI。我只愿意回答一些 AI 回答不了的问题，本文如此，其他情况亦然。
Three former Labour advisers, including the husband of an MP, have been released on bail after being arrested on suspicion of spying for China.
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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.
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