Graph Theory

　　Mo‘s Algorithm

　　　　https://www.hackerearth.com/practice/notes/mos-algorithm/

　　　　http://www.geeksforgeeks.org/mos-algorithm-query-square-root-decomposition-set-1-introduction/

　　　　http://codeforces.com/blog/entry/43230

Useful Webpages for Competitive Programming