I used to think the world was broken down by tribes. Then I thought it was broken down by rich and poor. Then I thought it was broken down by stupid and smart. But I know now that it is broken down by people who are alive and people who are dead.

写作就是呼吸，而呼吸就是生活。

Mathematical intuition often guides the development of algorithms, but it is the rigorous proof that ensures their correctness and efficiency.

The beauty of computer science is in its endless possibilities.