Correct Solutions by,
- Toshihiro Shimizu Kawasaki, Japan
- Choi Min Kyu, South Korea
- Magnus Jakobsson Lund, Sweden
- Mustafa Burak Topal İstanbul
- Haruhisa Oda Tokyo, Japan
- Serdar Hojayev Dashoguz, Türkmenistan
Solution: http://www.fen.bilkent.edu.tr/~cvmath/Problem/2211a.pdf