链接:https://ac.nowcoder.com/acm/contest/908/I 题意: Baby bear and his good friends are very fond of mushrooms. On this day, they go to 402 mushroom field together. Kuangyeye, the owner of the mushroom field, is very happy to see the children. He is goin…

一.K均值算法的优化目标 K-均值最小化问题,是要最小化所有的数据点与其所关联的聚类中心点之间的距离之和,因此 K-均值的代价函数(又称畸变函数 Distortion function)为: 其中…

D. Choosing Capital for Treeland time limit per test 3 seconds memory limit per test 256 megabytes input standard input output standard output The country Treeland consists of n cities, some pairs of them are connected with unidirectional roads. Over…

本篇博文讲述基因算法(Genetic Algorithm),基因算法是最著名的进化算法. 内容依然来自博主的听课记录和教授的PPT. Outline 简单基因算法 个体表达 变异 重组 选择重组还是变异? 1. 简单基因算法(Simple Genetic Algorithm) Holland's早期的基因算法被认为是“简单的基因算法”或是“权威的基因算法”.(simple genetic algorithm or canonical genetic algorithm) 1.1 直接举例说明 问…

OUATTARA Sie, RUAN Xiaogang, Yan yan Institute of Artificial Intelligence and Robots, School of Electronic Information and Control Engineering Beijing University of Technology Beijing, China   ' = ∑b1' (i) 2 /(n1 × p1 )                      (15) i=1…

A Gentle Introduction to the Gradient Boosting Algorithm for Machine Learning by Jason Brownlee on September 9, 2016 in XGBoost 0 0 0 0   Gradient boosting is one of the most powerful techniques for building predictive models. In this post you will d…

Problem Description It's yet another festival season in Gensokyo. Little girl Alice planned to pick mushrooms in five mountains. She brought five bags with her and used different bags to collect mushrooms from different mountains. Each bag has a capa…

Choosing Capital for Treeland Description The country Treeland consists of n cities, some pairs of them are connected with unidirectional roads. Overall there are n - 1 roads in the country. We know that if we don't take the direction of the roads in…

“Packbits” from ISO 12369 参考TIFF 6.0 Specification,点击TIFF, Version 6.0: @Section 9: PackBits Compression > This section describes TIFF compression type 32773, a simple byte-oriented runlength scheme. 描述[摘录] In choosing a simple byte-oriented run-leng…

Abstract Our dating site introduced scoring and its related functionalities innovatively, conforming to people's natural inclination to score people of the other sex, while other sites simply ignored. In addition, we use the 2012 Nobel Laureate El Ro…