凌恒飞跃：无脸见父老乡亲

好好复习：1231 and 1237 are just two (sufficiently large) arbitrary prime numbers. Any other two large prime numbers would do fine. When computing hash codes for composite objects it's common to add the hash codes for the components. If too small values are used in a hash set with a large number of buckets there's a risk of ending up with an uneven distribution of objects.

bugei：十月还有一些的，虽然不多了

熬点夜怎么了：当年我们学校有两个保送清华的名额，我没去。 一个原因是我不太喜欢北京的快节奏。 还有一个原因是：保送的人里面没有我。