計算復(fù)雜性的研究告訴我們，有些問題本質(zhì)上是困難的，無論我們的算法多么聰明。
"The study of computational complexity teaches us that some problems are inherently difficult, no matter how clever our algorithms are."
To read is to travel, to travel to other places, to other times, to other minds.
［厚葬使］已經(jīng)獲得的財產(chǎn),都拿來埋掉了；喪后本當(dāng)產(chǎn)生的財產(chǎn),又被長時間的禁止所消除。
Your attitude determines your altitude.