Problem statement is here: http://acm.timus.ru/problem.aspx?space=1&num=1877
Category: Timus
[Timus] 1638 Bookworm
Problem statement is here: http://acm.timus.ru/problem.aspx?space=1&num=1638
[Timus] 1585 Penguins
Problem statement is here: http://acm.timus.ru/problem.aspx?space=1&num=1585
[Timus] 1563 Bayan
Problem statement is here: http://acm.timus.ru/problem.aspx?space=1&num=1563
[Timus] 1545 Hieroglyphs
Problem statement is here: http://acm.timus.ru/problem.aspx?space=1&num=1545