理解学习问题的计算复杂性对于开发高效算法至关重要。

当你想要放弃的时候，想想你当初为什么坚持了这么久。

The time which we have at our disposal every day is elastic; the passions that we feel expand it, those that we inspire contract it; and habit fills up what remains.

有时候你必须接受，有些人注定不会永远留在你的生活中。