1、各大OJ网题目分类
https://acm.dhu.edu.cn:80/search3/KnowledgeList.jsp?id=70101
2、POJ题目分类
http://www.cnblogs.com/kuangbin/archive/2011/07/29/2120667.html
https://blog.csdn.net/wang_heng199/article/details/74479675
3、部分OJ网题目分类
4、OJ题目提交网站
https://vjudge.net/