The concept of polynomial-time reduction is central to understanding the structure of NP-complete problems.
所有的事情——除了爱——都应该从退出策略开始。要对结束做好准备。几乎所有事情都是进入容易抽身难。
技术是这样一种诀窍,它安排世界,使我们不必去体验它。
The only real hope is the hope of the heart.