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点分治是一种用于解决树上路径问题的思路。它的关键就是选中一点，统计经过该点的答案后删除点，再递归到两个子树中进行同样的操作。

艹了天天都被不知道的知识点教育，知道的又做不出来。 :lei:

Patrick Star bought a bookshelf, he named it ZYG !!

抄起我的混凝土数学，复习了会上升下降积分，看了看斯特林数和伯努利数。结果误把伯努利数的递推式看成了的，改了半天一到3次方以上就翻车，这才反应过来。

Before the start of contest, there are n ICPC contestants waiting in a long queue. They are labeled by 1 to n from left to right. It can be easily...

Alice 想要得到一个长度为 n 的序列，序列中的数都是不超过 m 的正整数，而且这 n 个数的和是 p 的倍数。

Roma is playing a new expansion for his favorite game World of Darkraft. He made a new character and is going for his first grind.

Wu got hungry after an intense training session, and came to a nearby store to buy his favourite instant noodles. After Wu paid for his purchase, the...