번호	제목
20796	Integers and Ranges
20797	Jailing
20798	Rikka with Game
20799	Rikka with Maximum Subsegment Sum
20800	Rikka with Random Tree
20801	Rikka with New Year's Party
20802	Rikka with Subsequence
20803	Rikka with Lake
20804	Rikka with Game Theory
20805	Rikka with Storehouse
20806	Rikka with RCPC
20807	Rikka with Book
20808	Rikka with Composite Number
20809	Rikka with Generals
20810	Rikka with Employees
20811	Öar
20812	Tebryggning
20813	Zoo
20814	Planet X
20815	Planetbacke