번호	제목
20996	Edit Distance Yet Again
20997	(Almost) Fair Cake-Cutting
20998	Jellyfish
20999	Flat Organization
21000	Archer Vlad
21001	A Very Different Word
21002	Cactus
21003	Social Distancing
21004	GCD vs. XOR
21005	Civilizations
21006	We apologize for any inconvenience
21007	Patrol Drone
21008	Social Justice
21009	Visible Trees
21010	Slow Down
21011	Instruction Anagram
21012	Project Team
21013	Occult Square
21014	Special Substring
21015	Hallway and Butler