运行报错：

PS D:\C++> cd "d:\C++\" ; if ($?) { g++ A+B problem.cpp -o A+B problem } ; if ($?) { .\A+B problem }
g++: The term 'g++' is not recognized as a name of a cmdlet, function, script file, or executable program.
Check the spelling of the name, or if a path was included, verify that the path is correct and try again.

https://www.luogu.com.cn/paste/dp4uode3