Past Contests
- 2011 Fukuoka site (Regional Problems (pdf), Domestic Problems)
- 2010 Tokyo site (Regional Problems (pdf), Domestic Problems)
- 2009 Tokyo site (Regional Problems (pdf), Domestic Problems)
- 2008 Aizu site (Regional Problems (pdf), Domestic Problems)
- 2007 Tokyo site (Regional Problems (pdf), Domestic Problems)
- 2006 Yokohama site (Regional Problems, Domestic Problems)
- 2005 Tokyo site (Regional Problems, Domestic Problems)
- 2004 Ehime site (Regional Problems (pdf), Domestic Problems)
- 2003 Aizu site (Regional Problems (pdf), Domestic Problems)
- 2002 Kanazawa site (Regional Problems (pdf), Domestic Problems)
- 2001 Hakodate site (Regional Problems (pdf), Domestic Problems)
- 2000 Tsukuba site (Regional Problems (pdf), Domestic Problems)
- 1999 Kyoto site (Regional Problems (pdf), Domestic Problems)
- 1998 Tokyo site (Regional Problems (pdf), Domestic Problems)