csacademy description 有\(M\)种颜色编号为\(1-M\).现给树上的每个点染上这\(M\)种颜色中的一种,定义一棵树是\(\mbox{colorful}\)的当且仅当这棵树上\(M\)种颜色都出现了至少一次.定义一片森林是\(\mbox{colorful}\)的当且仅当其中的每一棵树都是\(\mbox{colorful}\)的. 求\(n\)点带标号的\(\mbox{colorful}\)的森林的数量模\(924844033\). \(n\le10^5,m\le50\)…

C. Kyoya and Colored Balls Time Limit: 2000ms Memory Limit: 262144KB 64-bit integer IO format: %I64d      Java class name: (Any) Submit Status Kyoya Ootori has a bag with n colored balls that are colored with k different colors. The colors are labele…

点击打开链接 Colored Sticks Time Limit: 5000MS   Memory Limit: 128000K Total Submissions: 27955   Accepted: 7403 Description You are given a bunch of wooden sticks. Each endpoint of each stick is colored with some color. Is it possible to align the sticks…

Machine Learning Methods: Decision trees and forests This post contains our crib notes on the basics of decision trees and forests. We first discuss the construction of individual trees, and then introduce random and boosted forests. We also discuss…

Colored Sticks Time Limit: 5000MS   Memory Limit: 128000K Total Submissions: 28036   Accepted: 7428 Description You are given a bunch of wooden sticks. Each endpoint of each stick is colored with some color. Is it possible to align the sticks in a st…

Forests Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 5782   Accepted: 2218 Description If a tree falls in the forest, and there's nobody there to hear, does it make a sound? This classic conundrum was coined by George Berkeley (1685-1…

Colored Sticks Time Limit: 5000MS Memory Limit: 128000K Total Submissions: 32423 Accepted: 8556 Description You are given a bunch of wooden sticks. Each endpoint of each stick is colored with some color. Is it possible to align the sticks in a straig…

Kyoya Ootori has a bag with n colored balls that are colored with k different colors. The colors are labeled from 1 to k. Balls of the same color are indistinguishable. He draws balls from the bag one by one until the bag is empty. He noticed that he…

C. Kyoya and Colored Balls Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/554/problem/C Description Kyoya Ootori has a bag with n colored balls that are colored with k different colors. The colors are labeled from 1 to k.…

[基础算法] Random Forests 2011 年 8 月 9 日 Random Forest(s),随机森林,又叫Random Trees[2][3],是一种由多棵决策树组合而成的联合预测模型,天然可以作为快速且有效的多类分类模型.如下图所示,RF中的每一棵决策树由众多split和node组成:split通过输入的test取值指引输出的走向(左或右):node为叶节点,决定单棵决策树的最终输出,在分类问题中为类属的概率分布或最大概率类属,在回归问题中为函数取值.整个RT的输出由众多决策树…