https://github.com/ossu/computer-science
https://github.com/keithnull/TeachYourselfCS-CN
https://github.com/PKUanonym/REKCARC-TSC-UHT
https://github.com/QSCTech/zju-icicles
https://github.com/SSHeRun/CS-Xmind-Note
https://github.com/ossu/computer-science
https://github.com/keithnull/TeachYourselfCS-CN
https://github.com/PKUanonym/REKCARC-TSC-UHT
https://github.com/QSCTech/zju-icicles
https://github.com/SSHeRun/CS-Xmind-Note
def ADD(a): print(3,a,hex(id(a))) a.remove(2) print(3,a,hex(id(a))) a=a.append(10)