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: SPOJ.com - Problem ATOMS
COPRIME: SPOJ.com - Problem NCOPRIME
BITS: SPOJ.com - Problem BITS
SUBXOR: SPOJ.com - Problem SUBXOR
CIRCLES: SPOJ.com - Problem TWOCIR
NAUGHTY: SPOJ.com - Problem NAUGHTY
DRUNK: SPOJ.com - Problem DRUNK
DURIN: SPOJ.com - Problem DURIN
GIVEAWAY: SPOJ.com - Problem GIVEAWAY
MACHMAY: SPOJ.com - Problem MACHMAY
INGREDIE:SPOJ.com - Problem INGRED
QUEENS: SPOJ.com - Problem QSTABLE