我们可以通过VMWare来安装,但是通过VMWare安装大家经常会碰到网络ip连接问题,为了减少额外的环境因素影响,以下介绍通过VirtualBox结合Vagrant来安装虚拟机
VirtualBox官网:Oracle VM VirtualBox
Vagrant官网:Vagran…
题面翻译
Rebecca 有一张落基山脉的照片,上面排列着 N ( 1 ≤ N ≤ 5000 ) N(1\leq N \leq 5000) N(1≤N≤5000) 座山,从左向右的第 i i i 座山的高度是 h i ( 1 ≤ h i ≤ 1 0 5 ) h_i(1\leq h_i \leq 10^5) hi(1≤hi≤105)。Rebecca 截图保留照…
MySQL 字符串存储类型比较
1. CHAR
固定长度字符串最大长度为 255 字符存储时右padding空格到指定长度检索时自动删除尾随空格适用于长度固定的短字符串(如邮政编码)
示例:
CREATE TABLE example (id INT, code CHAR(5));
INSERT INTO ex…
Here is the code for you to see directly, however, there are a few points.
1. in the second ‘if’ clause, note the existence of the root node
2. Once there is at least one false value among the serval judgment values, the result after the && ope…