In Opera this problem:

http://acm.timus.ru/problem.aspx?space=1&num=1633&locale=ru

show wrong. Is it your or Opera bug?
Additional information:
http://forum.sources.ru/index.php?showtopic=111412&st=1471&#entry2184062
On this forum we discuss this bug.
Sorry for my bad english

Edited by author 31.01.2009 17:31