传送门 今天在HackerRank上翻到一道高精度题,于是乎就写了个高精度的模板,说是模板其实就只有乘法而已. Extra long factorials Authored by vatsalchanana on Jun 16 2015 Problem Statement You are given an integer N. Print the factorial of this number. N!=N×(N−1)×(N−2)×⋯×3×2×1 Note: Factorials of N>20…

时间限制:1 秒 内存限制:32 兆 特殊判题:否 提交:2109 解决:901 题目描述: John von Neumann, b. Dec. 28, 1903, d. Feb. 8, 1957, was a Hungarian-American mathematician who made important contributions to the foundations of mathematics, logic, quantum physics, meteorology, scienc…

Description John von Neumann, b. Dec. 28, 1903, d. Feb. 8, 1957, was a Hungarian-American mathematician who made important contributions to the foundations of mathematics, logic, quantum physics,meteorology, science, computers, and game theory. He wa…

http://jasonjl.me/blog/2015/03/30/practical-programming-practice-services/ Codewars, Leetcode, Hackerrank. Online Judges Reviews written March 30, 2015 in algorithms, programming, review Sometimes the projects you work on just aren’t stimulating enou…

时间限制:1 秒 内存限制:32 兆 特殊判题:否 提交:1845 解决:780 题目描述: John von Neumann, b. Dec. 28, 1903, d. Feb. 8, 1957, was a Hungarian-American mathematician who made important contributions to the foundations of mathematics, logic, quantum physics, meteorology, scienc…

很多朋友在用mysql进行调优的时候都肯定会用到explain来看select语句的执行情况,这里简单介绍结果中两个列的含义. 1 type列 官方的说法,说这列表示的是"访问类型",更通俗一点就是:mysql找到需要的数据行的方式.一下就是从效率最差到最好顺序分别介绍下: All 这个就是所谓的全表扫描,没有用到任何的index,mysql就是从头到尾把整个表遍历一边,找到所需要的数据行.效率是最差的.如下图,这个表中的usertype不是索引,这个查询中没有用到任何索引,所以就出现…

题目传送门:https://www.hackerrank.com/challenges/unique-colors 感谢hzq大神找来的这道题. 考虑点分治(毕竟是路经统计),对于每一个颜色,它的贡献是独立的.我们可以在一次点分治中合在一块处理(为什么时间复杂度是对的呢,因为我们每次改动只会根据当前点的颜色进行变动,而不是所有颜色对着它都来一遍).每次先对重心单独计算答案贡献,此时也将当前区域的各个答案贡献计算出来,并以此为基础(之后称之为基准贡献,即代码中的tot).对于每一棵子树,我们先df…

最近遇到一个问题 seport is not a legal parameter in an Ansible task or handler 原因是我本地 Ansible 的 Extra Modules 已经过时,需要更新.但是Ansible的官方文档只给了这么一句话 There should be no need to install this repo separately as it should be included in any Ansible install using the o…

问题一 sed编辑命令:[sed -i 's/a/b/g' test.txt]   报错:sed: 1: "test.txt": undefined label 'est.txt'   解决方案:增加一个备份的追加名[sed -i '.bak' 's/a/b/g' test.txt]   原因:mac强制要求备份,否则报错 当然可以不使用其他备份名字,只是用’',就可以只保留一份 sed -i ‘’ ’s/a/b/g’ test.txt   问题二 sed追加命令:[sed -i ''…

传送门 Problem Statement Ms.Kox enjoys her job, but she does not like to waste extra time traveling to and from her office. After working for many years, she knows the shortest-distance route to her office on a regular day. Recently, the city began regu…