Weekly Training Farm Contest Series are hosted in Codeforces group tw-icpc-blog.
Some of the problems are original problems while others are derived from classical problems.
Problems are estimated as Div2 contest with scoring distribution: 500-1000-1500-2000-2750
Hope all of you will enjoy the contest!
UPD: The contest will start in about 6 hours. Registration is open now!
UPD2: Contest will start in 5 minutes. Good Luck!
UPD3: editorial in Chinese and English is available now!