MO Algorithm HELP?

can anyone explain me how does MO algorithm work or can prefer me any other source to read apart from the link given below?

Link : http://blog.anudeep2011.com/mos-algorithm/

i could find all these see if its helpful:
http://codeforces.com/blog/entry/7383 … also read this editorial … http://discuss.codechef.com/questions/66188/qchef-editorial

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