Extracted from Section 17.4 Random Numbers, C++ Primer 5th. Ed. The random-number library generates random numbers through a set of cooperating classes: random-number engines and random-number distribution classes. An engine generates  a sequence of…

Tamref love random numbers, but he hates recurrent relations, Tamref thinks that mainstream random generators like the linear congruent generator suck. That's why he decided to invent his own random generator. As any reasonable competitive programmer…

Generating Gaussian Random Numbers http://www.taygeta.com/random/gaussian.html This note is about the topic of generating Gaussia  pseudo-random numbers given a source of uniform  pseudo-random numbers. This topic comes up more frequently than I woul…

Tamref love random numbers, but he hates recurrent relations, Tamref thinks that mainstream random generators like the linear congruent generator suck. That's why he decided to invent his own random generator. As any reasonable competitive programmer…

★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★➤微信公众号:山青咏芝(shanqingyongzhi)➤博客园地址:山青咏芝(https://www.cnblogs.com/strengthen/)➤GitHub地址:https://github.com/strengthen/LeetCode➤原文地址:https://www.cnblogs.com/strengthen/p/10305789.html ➤如果链接不是山青咏芝的博客园地址,则可能是爬取作者的文章…

Most computer programs do the same thing every time they execute, given the same inputs, so they are said to be deterministic. Deterministic is usually a good thing, since we expect the same calculation to yield the same result. For some applications…

We have the ability to select a single random card from a pile of twelve cards, but we would like to pull a total of nine. Not only that, we would like to match the same transition functions we have been writing all along. Lucky for use there are thr…

import numpy as np def test_run(): data=np.random.random((3,4)) """ [[ 0.80150549 0.96756513 0.18914514 0.85937016] [ 0.23563908 0.75685996 0.46804508 0.91735016] [ 0.70541929 0.04969046 0.75052217 0.2801136 ]] """ data=np.ra…

题目链接:http://codeforces.com/gym/101466/problem/K 题目: 题意: 给你一棵有n个节点的树,根节点始终为0,有两种操作: 1.RAND:查询以u为根节点的子树上的所有节点的权值的乘积x,及x的因数个数. 2.SEED:将节点u的权值乘以x. 思路: 比赛时少看了因数不大于13这句话,然后本题难度增加数倍,肝了两个小时都没肝出来,对不起队友啊,今天的组队训练赛实力背锅…… 这题一眼线段树,由于是对一棵子树进行处理,因此我们采用常规套路,借助dfs序将子树…

http://acm.bnu.edu.cn/v3/problem_show.php?pid=52733 [题意] 给定一棵树,这棵树每个点都有一个点权,标号从0开始,0是根结点 修改操作: SEED 1 13 把结点1的点权乘上13 查询操作: RAND 1 查询结点1为根的子树所有结点权的总乘积,以及这个总乘积有多少个因子 题目保证结果的质因子最大为13 [思路] 质因子最大为13,那么我们可以枚举质因子2 3 5 7 11 13,共6个 只要我们知道子树乘积这六个质因子的个数,我们就能算出子…