ARTS第九周打卡
Algorithm : 做一个 leetcode 的算法题
/* 两数之和
给定一个整数数组 nums 和一个目标值 target,请你在该数组中找出和为目标值的那 两个 整数,并返回他们的数组下标。 你可以假设每种输入只会对应一个答案。但是,你不能重复利用这个数组中同样的元素。 示例: 给定 nums = [2, 7, 11, 15], target = 9 因为 nums[0] + nums[1] = 2 + 7 = 9
所以返回 [0, 1] */ class Solution {
public:
vector<int> twoSum(vector<int>& nums, int target) {
unordered_map<int, int> stTmpMap;
vector<int> vect; // 时间复杂度O(n),空间复杂度O(n)
for(int i = 0; i < (int)nums.size(); i++)
{
int iComplement = target - nums[i];
if(stTmpMap.find(iComplement) != stTmpMap.end())
{
vect.push_back(stTmpMap[iComplement]);
vect.push_back(i);
// break; // 如果只有一对符合要求!!!
}
stTmpMap[nums[i]] = i;
} return vect;
}
};
Review : 阅读并点评一篇英文技术文章
原文链接:https://dev.mysql.com/doc/refman/8.0/en/data-types.html
MySQL supports a number of SQL data types in several categories: numeric
types, date and time types, string (character and byte) types, spatial types, and
the
JSON
data type.MYSAL支持多种数据类型:数字类型、时间和日期类型、字符串(字符和字节)类型、空间类型和JSON数据类型;
This chapter provides an overview(概述) of these data types, a more detailed
description of the properties of the types in each category, and a
summary of the data type storage requirements. The initial overview is
intentionally brief. The more detailed descriptions later in the chapter should be
consulted for additional information about particular data types, such as the
permissible formats in which you can specify values.
Data type descriptions use these conventions:(数据约定)
For integer types,
M
indicates the maximum display width. For floating-point and fixed-point types,M
is the total number of digits that can be stored (the precision). For string types,M
is the maximum length. The maximum permissible value ofM
depends on the data type.对于整数类型,M表示最大显示宽度;对于浮点型和定点型,M是可存储的位数(精度);对于字符串类型,M是最大长度,M的最大允许值取决于数据类型。
D
applies to floating-point and fixed-point types and indicates the number of digits followingthe decimal point (the scale). The maximum possible value is 30, but should be no greater than
M
−2.
fsp
applies to theTIME
,DATETIME
, andTIMESTAMP
types and represents fractional seconds precision; that is, the number of digits following the decimal point for fractional parts of seconds. Thefsp
value, if given, must be in the range 0 to 6. A value of 0 signifies that there is no fractional part. If omitted, the default precision is 0. (This differs from the standard SQL default of 6, for compatibility with previous MySQL versions.)Square brackets (
[
and]
) indicate optional parts of type definitions.
Tips : 学习一个技术技巧
基于数组和链表实现的内存管理器实现
https://www.cnblogs.com/yzdai/p/11442172.html
Share : 分享一篇有观点和思考的技术文章
Lua学习:https://blog.csdn.net/qq_35718410/article/details/52767518
最新文章
- mysql的DATE_FORMAT用法
- Java 读写文件方案
- 备忘: Install MODI for use with Microsoft Office 201x
- dfs序 + RMQ = LCA
- 安装CentOS 7时出现No Caching mode page found问题的解决
- sdut 487-3279【哈希查找,sscanf ,map】
- page resizing
- 一排cell就第一个cell要点两次才响应,其他的cell都点一下就响应
- 2013 ACM/ICPC Asia Regional Chengdu Online 1004 Minimum palindrome
- SVG 2D入门5 - 颜色的表示
- spring(spring boot)笔记
- Sketch网页截屏插件设计开发
- VMware vSphere
- rsync同步目录
- 【scrapy】关于爬取的内容是Unicode编码
- Linux进程地址空间和虚拟内存
- web和wap网站的区别 (转)
- 线程池ThreadPoolExecutor参数设置
- Power Systems 虚拟化简介
- java实时监听日志写入kafka
热门文章
- TCP四次握手断开连接
- python3编程基础之一:量的表示
- 报错:Table &#39;sell.hibernate_sequence&#39; doesn&#39;t exist
- 激活函数,Batch Normalization和Dropout
- uboot的仓库在哪里?
- Javascript-基本类型
- [webpack]深入学习webpack核心模块tapable
- react图片自适应组件
- 阶段5 3.微服务项目【学成在线】_day18 用户授权_19-微服务之间认证-Feign 拦截器
- 微信支付相关,如何获取API证书