徐公砚的特点是什么？？

徐公砚早在唐宋时期即负盛名，产自山东沂南，属于鲁砚中的重要品种。徐公砚的特点是石质坚硬，密度极高。叩之清脆，其声如磬，下墨如挫，发墨如油，色泽鲜润，且不损毫，堪称砚石材中之上品。

张店快餐店转让？

What is order notation f(n)=O(g(n))?

Question 1: Under what circumstances would O(f(n)) = O(k f(n)) be the most appropriate form of time-complexity analysis?

C++ Profiling: KiFastSystemCallRet

I searched for this after seeing it\'s the top rated item when profiling using Very Sleepy, andit seems everyone gets the answer \"it\'s a system function, ignore it\". But Sleepy\'s hint for the func