Ehab's REAL Number Theory Problem 前置知识 质数 分解质因数 无向无权图最小环<讲> Ehab's REAL Number Theory Problem/onCF 给 \(n\) 个数 \(a_i\)(\(a_i\) 的因数个数不超过 \(7\)),求最少选出多少个数,使得乘积为完全平方.无解输出 \(-1\). 数据范围:\(1\le n\le 10^5\),\(1\le a_i\le 10^6\). 没想到一场普通的 \(\texttt{CF}\) 比赛能…

Problem Management Problem management seeks to identify the underlying causes of incidents in an IT infrastructure and to remove those causes. The problem management process addresses the causes of incidents reactively and proactively. Reactive probl…

Source: verysmartbrothas.com It has been confusing since my first day as a PhD student about theory and its relationships with science, and other interchangeable concepts such as models, hypothesis and conceptual framework. Now I am beginning to get…

Notes on the Dirichlet Distribution and Dirichlet Process In [3]: %matplotlib inline   Note: I wrote this post in an IPython notebook. It might be rendered better on NBViewer. Dirichlet Distribution The symmetric Dirichlet distribution (DD) can be co…

参考文章: JAVA NIO之浅谈内存映射文件原理与DirectMemory Java NIO 2.0 : Memory-Mapped Files | MappedByteBuffer Tutorial How Java I/O Works Internally at Lower Level? 1. JAVA I/O theory at lower system level Before this post, We assume you are fmailiar with basic JAVA…

Problem E. TeaTree Problem Description Recently, TeaTree acquire new knoledge gcd (Greatest Common Divisor), now she want to test you.As we know, TeaTree is a tree and her root is node 1, she have n nodes and n-1 edge, for each node i, it has it’s va…

Chinese Postman Problem is a very famous hard problem in graph theory. The problem is to find a shortest closed path or circuit that visits every edge of a (connected) undirected graph. When the graph has an Eulerian Circuit (a closed walk that cover…

Problem E. TeaTree Problem Description Recently, TeaTree acquire new knoledge gcd (Greatest Common Divisor), now she want to test you. As we know, TeaTree is a tree and her root is node 1, she have n nodes and n-1 edge, for each node i, it has it's v…

Motivation An observation and thoughts on reading Tel G.. Introduction to Distributed Algorithm(second edition). Cambridge University Press: 2000. How to build the theoretical abstraction of properties and behaviors about a specific system: (1) syste…

Problem Description A subsequence of a given sequence is the given sequence with some elements (possible none) left out. Given a sequence X = <x1, x2, ..., xm> another sequence Z = <z1, z2, ..., zk> is a subsequence of X if there exists a stri…