Hi,
Here are the link to the editorials:
http://web.iiit.ac.in/~lalit.kundu/editorials.html
http://web.iiit.ac.in/~lalit.kundu/editorials.pdf
Problems are available for practice on spoj.
ATOMS: http://www.spoj.com/problems/ATOMS/
COPRIME: http://www.spoj.com/problems/NCOPRIME/
BITS: http://www.spoj.com/problems/BITS/
SUBXOR: http://www.spoj.com/problems/SUBXOR/
CIRCLES: http://www.spoj.com/problems/TWOCIR/
NAUGHTY: http://www.spoj.com/problems/NAUGHTY/
DRUNK: http://www.spoj.com/problems/DRUNK/
DURIN: http://www.spoj.com/problems/DURIN/
GIVEAWAY: http://www.spoj.com/problems/GIVEAWAY/
MACHMAY: http://www.spoj.com/problems/MACHMAY/
INGREDIE:http://www.spoj.com/problems/INGRED/