Correct Solutions by,
- Toshihiro Shimizu Kawasaki, Japan
- Halil İbrahim Kanpak Koç University
- Gurt Devletov The State Energy Institute, Mary, Turkmenistan
- Magnus Jakobsson Lund, Sweden
- Roger Bengtsson Lund, Sweden
- Ozan Cem Baş Bilkent University
- Ahmet Yüksel Aydın
- Steffen Weber Ismaning, Germany
- Alper Balcı Bilkent University
- Deniz Can Karaçelebi Özel İzmir Bahçeşehir Fen ve Teknoloji Lisesi
- Leyla Cafarova
- Lujain Qazmanny Jordan
- Şevket Onur Yılmaz Kabataş Erkek Lisesi, Istanbul
- Hüseyin Ege Olcay Bilkent University
- Gürkan Koray Akpınar Efeler, Aydın
Solution: http://www.fen.bilkent.edu.tr/~cvmath/Problem/2111a.pdf