NP中的每个问题都可以归约为可满足性问题，这是计算复杂性理论的基石。
Every problem in NP can be reduced to the satisfiability problem, which is the cornerstone of computational complexity theory.
"The greatest mystery is not in the stars, but in ourselves."
The most important thing is not the triumph, but the struggle.
只要我人在国外,我绝不攻击本国的正辅。等回去我再补回来。
The act of writing is an act of resistance against the forces that seek to silence us.