参考:

c++ 中 char 与 string 之间的相互转换问题
https://www.cnblogs.com/devilmaycry812839668/p/6353807.html

c++已经是字符串string了，怎么具体提取其中的某个字母
https://zhidao.baidu.com/question/388222143.html

C++ 字符串
https://www.runoob.com/cplusplus/cpp-strings.html

C++怎么从一个字符串中读取一个字符？
https://zhidao.baidu.com/question/259704265.html

C++ string substr()
https://blog.csdn.net/sunshihua12829/article/details/50484966

C++中int与string的相互转换
https://blog.csdn.net/u010510020/article/details/73799996

c++ 将一个char 转化为string
https://blog.csdn.net/carbon06/article/details/79353821

参考:

请教 如何将 list 转化为 double数组
https://bbs.csdn.net/topics/320049060

List转数组：官方是这样给出的例子
https://blog.csdn.net/qq_41033385/article/details/104311337

参考:

STM32F103 通过SD卡IAP升级程序，带MD5校验，（带源码）可在实际项目中使用
https://blog.csdn.net/qq_15181569/article/details/106852095

文件md5在线计算
http://www.metools.info/other/o21.html

STM32F103通过Ymodem协议更新程序带MD5校验
https://blog.csdn.net/qq_15181569/article/details/115762289

参考:

Java 中初始化 List 的五种方法
https://www.jianshu.com/p/4c8c0e78061d#:~:text=%E5%9C%A8%20Java%20%E4%B8%AD%E5%88%9D%E5%A7%8B%E5%8C%96%20List%20%E7%9A%84%E4%BA%94%E7%A7%8D%E6%96%B9%E6%B3%95%201.%E6%9E%84%E9%80%A0%20List%20%E5%90%8E%E4%BD%BF%E7%94%A8,List.add%20%E5%88%9D%E5%A7%8B%E5%8C%96%202.%E4%BD%BF%E7%94%A8%20%7B%20%7B%7D%7D%20%E5%8F%8C%E6%8B%AC%E5%8F%B7%E8%AF%AD%E6%B3%95%203.%E4%BD%BF%E7%94%A8%20Arrays.asList

参考:

java数组的四种拷贝方式
https://blog.csdn.net/weixin_42220532/article/details/84200634

参考:

SQLite数据库版本升级
https://blog.csdn.net/feibendexiaoma/article/details/79526187

sqlite 升级
https://blog.csdn.net/coding_or_coded/article/details/7778865?spm=1001.2101.3001.6650.1&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-1.pc_relevant_paycolumn_v2&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-1.pc_relevant_paycolumn_v2&utm_relevant_index=2

Android数据库Sqlite的基本用法及升级策略
https://blog.csdn.net/u013700502/article/details/78764917?utm_medium=distribute.pc_relevant.none-task-blog-2~default~baidujs_baidulandingword~default-1.pc_relevant_paycolumn_v2&spm=1001.2101.3001.4242.2&utm_relevant_index=4

update和upgrade的主要区别
https://blog.csdn.net/liuzehn/article/details/83651587

参考:

SG滤波原理
https://www.cnblogs.com/zwjun/p/13745059.html

Savitsky-Golay滤波器及源码实现
https://blog.csdn.net/lovelyaiq/article/details/88681499

Savitzky-Golay 滤波器详解及C/matlab语言程序设计
https://blog.csdn.net/shenziheng1/article/details/53391422

Savitzky-Golay 滤波器
https://blog.csdn.net/liyuanbhu/article/details/9094945

Savitzky-Golay平滑去噪
https://blog.csdn.net/qq_20823641/article/details/51537461?spm=1001.2101.3001.6650.1&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-1.pc_relevant_aa&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-1.pc_relevant_aa&utm_relevant_index=2

savitzky-golay-filter
https://github.com/swallez/savitzky-golay-filter/tree/master/vis/src/mr/go/sgfilter/vis/app

savitzky-golay-filter
https://github.com/mraad/savitzky-golay-filter

Android-App-Accelerometer-using-Savitzky-Golay-filter-
https://github.com/raghupati1996/Android-App-Accelerometer-using-Savitzky-Golay-filter-

sgolayFilter
https://github.com/akshaykota/sgolayFilter

jDSP
https://github.com/psambit9791/jDSP

参考:

sql 语句中as的用法和作用
https://www.cnblogs.com/alex0702/p/10766821.html

sqlite之query、rawQuery区别；moveToNext，moveToFirst区别
https://blog.csdn.net/sinat_31057219/article/details/79410588

Android 使用SQLite数据库使用Cursor（游标）来进行操作
https://blog.csdn.net/guodongsun0/article/details/45417707

sqlite使用总结
https://www.jianshu.com/p/39f9fc519077?nomobile=yes

参考:

sql语句查询多对多数据各个状态的数量
https://blog.csdn.net/qq_40393093/article/details/84190999

SQL查询记录总数
https://blog.csdn.net/iiithsoul/article/details/9977709?spm=1001.2101.3001.6650.1&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7ELandingCtr%7Edefault-1.queryctr&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7ELandingCtr%7Edefault-1.queryctr&utm_relevant_index=2

SQL查记录总数-总数统计的方法
https://blog.csdn.net/q2941467430/article/details/119112313?spm=1001.2101.3001.6650.1&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-1.pc_relevant_paycolumn_v2&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-1.pc_relevant_paycolumn_v2&utm_relevant_index=2

如何统计SQL语句查询出来的条数？
https://bbs.csdn.net/topics/350165319

sql查询语句,查数据库中一共多少条记录
https://ask.zol.com.cn/x/10763978.html

sql语句统计查询结果数量怎么写？
https://zhidao.baidu.com/question/1900371557735372700.html

SQL语句——查询记录的数量
https://blog.csdn.net/duling509/article/details/3400718

参考：

java中int转成String位数不足前面补零
https://blog.csdn.net/u013991521/article/details/55819876

Android 开发数字不足位数前面补0
https://blog.csdn.net/qq_32556691/article/details/106567017

java整形格式化补0_Java Android 开发数字不足位数前面补0
https://blog.csdn.net/weixin_39884373/article/details/114594757?spm=1001.2101.3001.6650.1&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-1.pc_relevant_paycolumn_v2&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-1.pc_relevant_paycolumn_v2&utm_relevant_index=2

Android 数字转字符串、保留两位小数、千分位、补 0、百分比
http://cftea.com/c/2017/03/6843.asp