思考题 for Hakurei Reimu Legacy of Lunatic Kingdom ZJS loves playing Touhou. In the famous STG game Touhou:Legacy of Lunatic Kingdom the game rules are defined as follows: The game consists of N "stages". Player start from Stage 1 and ends at Stage……

hi。我是队中最不给力的XGN。今天是MUTC第二场……我来瞎写一下今天的所见所闻。 「NOON」 中午12：00，比赛开始。和上次一样，我在上课。MK倒是在世贸可以参加比赛。SYR我就不知道了。反正等我到世贸的时候，大概12：15，世贸停电中……SYR没有到，空调没有开，没有灯和……

OGF - Cayley Formula Question Statement Prove # of trees on [n] = n^{n-2} Solution f:(1,2,3,...,n)\to(1,2,3,...,n) f(1)=1,f(n)=n Functional Digraph(directed graph) D V(D)=[n] 编者注：V为节点集合 (i,j)\in E(D) if f(i)=j 注：E为边集合 Example | ……

$\mathcal A$ is a collection of combinatorial objects. => $\mathcal A$ and $\mathcal B$ are combinatorically isomorphic if there exist a size-preserving bijection between $\mathcal A$ and $\mathcal B$ Q1 Prove that number of Dyck Paths D_{n-1} equa……

思考题 of math again Slime Legend II In the world of fantasy, there lives N+1 types of monsters indexed from 0 to N. Each monster can be represented by an integer pow_i - their power. And specially, type 0 is SLIME. Slime has a special ability to "……

2019多校 Diary Round 1 各位好，我是（问gwq骗取了贵studios的admin的账号和密码的）syr。 （因为blog内容要公开，我就写得政治正确一点吧。。。） Preparation 在20190721的比赛前半个小时，syr/xgn/monkey king终于拿到了他们的账号 syr开通了skype，加入群聊“多校……

Today is the first day of MUTC!!! On this site there will be diary about our team (team0248). Good luck! MUTC is a series of OI contests held every year usually 10 contests in a row.

In a recent Codeforces Contest Codeforces Global Round 4, the Orange Boy MonkeyKing got a T-shirt by getting rank 449. BEST RATING CHANGE

You are given something, what is it? You don't know, but you are curious about it. You want to know what it is, but you can't. It made you unpleasant, you are somewhat angry. 当你的野心还撑不起你的才华时，就应该静下心来评论一下。 Formally,you are g……

思考题 that is quite easy FACT ZJS likes to show off his wonderful calculator. His calculator can do FACT operation which means can divide an integer to some primes' products. For example, Fact(30) will display 2\times3\times5 which is a string of ……