Hi again! I just learned Catalan's numbers and I am searching for CF's tasks, which use this kind of numbers. I will be glad if you could tell me. Thank you very much!!!
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I cant remember any CF problems but I can refer you to OpenCup's problem. Its name is "Pills".
here http://www.opencup.ru/files/occ/gp5/problems-e.pdf
http://www.codeforces.com/problemset/problem/9/D
http://main.edu.pl/en/archive/oi/7/kod
any analysis for the task?
http://www.oi.edu.pl/static/attachment/20110731/oi7/kod.html It's in Polish though.