https://blog.csdn.net/linleiqin/article/details/5639910数学
https://blog.csdn.net/liuqiyao_01/article/details/9079611题集
https://blog.csdn.net/liujian20150808/article/details/50845827图论
https://www.cnblogs.com/flipped/p/5005693.html综合
https://blog.csdn.net/love20165104027/article/details/79679072动归
http://www.cnblogs.com/kuangbin/archive/2011/07/29/2120667.html POJ
http://www.pythontip.com/acm/problemCategory 各大OJ
https://blog.csdn.net/w_k_l/article/details/77418449 各大OJ