"A book is a world you can hold in your hands."
书是一个你可以握在手中的世界。
手书黄埔军官学校训词(中国国民党党歌词,中华民国国歌歌词)
"The study of computational complexity teaches us that some problems are inherently difficult, no matter how clever our algorithms are."
"A good novel should unsettle you, make you question what you thought you knew."
最好的书是改变你思维方式的书。
NP完全性的概念为理解问题的复杂性提供了一个强大的工具。