First: what is Reversed automatic differentiation? Google or Baidu 首先请通过百度或者谷歌学会反向自动微分是什么～

Simple pick up of Lex & Yacc (flex & bison):

1. yacc & lex online manual http://dinosaur.compilertools.net/
2. Mini-C-Compiler in yacc https://github.com/rabishah/Mini-C-Compiler-using-Flex-And-Yacc
3. generating file：lex translate.l yacc translate.y gcc y.tab.c -ly -ll（google it and you'll get it）
4. small calculator https://developer.ibm.com/technologies/systems/tutorials/au-lexyacc/
5. try to read as much as you can! Good luck.

快速入门必看：

1. yacc和lex简洁版手册 http://dinosaur.compilertools.net/
2. 小型c语言编译器 https://github.com/rabishah/Mini-C-Compiler-using-Flex-And-Yacc
3. linux编译命令行：lex translate.l 下一句yacc translate.y 下一句gcc y.tab.c -ly -ll（可能有区别建议百度）
4. 小型计算器 https://developer.ibm.com/technologies/systems/tutorials/au-lexyacc/
5. 本实验要求巨大多英文阅读能力，请多多加油～
6. 中科大2020CS编译原理zql班实验