The lightning that precedes the thunder is a common image of the warnings that come before calamity.

I don't need a reason to be proud of myself.

Mathematics is the foundation upon which we build our understanding of the world, and it is through this understanding that we can solve the most complex problems.

In the end, we will remember not the words of our enemies, but the silence of our friends.

The most important thing is to keep the most important thing the most important thing.

我是一个幸存者，我不会放弃，我不会停止，我会更加努力。

动态规划理论基于最优性原理，该原理指出，无论初始状态和初始决策如何，剩余决策必须构成关于第一个决策所导致状态的最优策略。