The concept of polynomial-time reduction is central to understanding the structure of NP-complete problems.
多项式时间归约的概念对于理解NP完全问题的结构至关重要。
"Doubt is useful for a while. We must all pass through the garden of Gethsemane. If Christ played with doubt, so must we."
【译文】人活一辈子，就像花草树木繁荣，一春一秋，非常短暂。年少时不知道勤学苦读，弹指间就会变成白发老翁。月亮过了十五后光明就会越来越少，人到中年还一事无成，也就不会有大的作为了。
Lightness is not just physical, but also spiritual.
"I believe in the power of books to change lives."