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C - Friends and Gifts-CodeForces - 1283C-ZUT周赛
C. Friends and Gifts time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output There are nn friend ...
分类:其他好文   时间:2020-11-01 10:31:24    阅读次数:17
hdu5172 GTY's gay friends - 线段树查询区间数字是否只出现一次
给出一个序列,m个查询,每次查询区间是否是$[1, r - l + 1]$的排列 判断是否是排列: 即每个数字只出现一次 区间和是$\frac{n * (n + 1)}{2}$,n是区间长度。 判断每个数字是否只出现一次,可以预处理每个数之和第一次出现这个数字的位置,如果没有那么设置为0,然后用线段 ...
分类:其他好文   时间:2020-09-18 00:02:53    阅读次数:30
初级美语 L067:Getting Married 解析
一、Reading My girlfriend and I are going to get married this year. We are going to have a big wedding party. All our friends and relatives are going to ...
分类:其他好文   时间:2020-07-29 10:36:23    阅读次数:74
一次数据库性能优化测试,整理最全数据库优化方案,还不快收藏
由于配置是运行过那么长时间,很稳定,基本上不考虑,所以本次主要是sql的优化,并且集中在业务的个人空间。下面是这次优化的数据库版本: 案例一:粉丝查询优化 粉丝查询有2条sql --查询所有粉丝SELECT user FROM osc_friends f INNER JOIN osc_users u ...
分类:数据库   时间:2020-07-23 23:07:42    阅读次数:101
Codeforces #657 Problem B
##题目 Pasha loves to send strictly positive integers to his friends. Pasha cares about security, therefore when he wants to send an integer n, he encry ...
分类:其他好文   时间:2020-07-19 23:37:51    阅读次数:80
初级美语 L027:Jack and His Dog 解析
一、Reading Jack seldom gets together with his friends. He usually stays at home with his pet dog, Lucky. They sometimes go for long walks in the park. ...
分类:其他好文   时间:2020-07-17 14:08:23    阅读次数:76
Linux 字符处理之【grep】
参数: -i: 不区分大小写 -c: 统计包含匹配的行数 -n: 输出行号 -v: 反向匹配 示例文件: (example.txt) The cat's name is Tom, what's the mouse's name? The mouse's NAME is Jerry They are ...
分类:系统相关   时间:2020-07-07 20:11:38    阅读次数:71
L - Lost's revenge HDU - 3341 (AC自动机 + 记忆化搜索 + 变进制算法)
Lost and AekdyCoin are friends. They always play "number game"(A boring game based on number theory) together. We all know that AekdyCoin is the man c ...
分类:编程语言   时间:2020-07-07 12:52:15    阅读次数:93
Object.create()和new 创建对象的区别
Object.create()方法是ECMAScript5中新增的,用来规范化原型式继承的。这个方法接收两个参数,一个是用作新对象原型的对象,和一个为新对象定义额外属性的(可选)对象。 var person = { name: "Nicholas", friends: ["John", "Jane" ...
分类:其他好文   时间:2020-07-05 15:49:26    阅读次数:90
writing: friendship and growth
Welcome!!! to my presentation !, About friendship, and growth. When i was little(靠过来正式), i used to make many friends. no matter who they are!, we can ...
分类:其他好文   时间:2020-06-29 00:51:57    阅读次数:104
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