1.cppreference（首选）
https://en.cppreference.com
2.LearnCpp
https://www.learncpp.com
3.Cplusplus
http://www.cplusplus.com
4.TutorialsPoint
https://www.tutorialspoint.com/cplusplus
5.Awesome C++
https://github.com/fffaraz/awesome-cpp
6.Lintcode 领扣
https://www.lintcode.com
7.洛谷
https://www.luogu.com.cn
