11.12
莫比乌斯反演 http://acm.hdu.edu.cn/showproblem.php?pid=4746
11.13
莫比乌斯反演 http://acm.hdu.edu.cn/showproblem.php?pid=4675
莫比乌斯反演 http://acm.hdu.edu.cn/showproblem.php?pid=6363
11.14
树上差分+树状数组 https://codeforces.com/problemset/problem/1076/E
贪心 http://codeforces.com/problemset/problem/1076/F
辣鸡 http://codeforces.com/problemset/problem/1075/B