번호	제목
28173	Another Goose Goose Duck Problem
28174	Range Closest Pair of Points Query
28175	Dice Game
28176	Maximum GCD
28177	Permutation Compression
28178	Greedy Bipartite Matching
28179	Banshee
28180	Courses
28181	Two Missing Numbers
28182	Elimination Race
28183	Forever Young
28184	Good and Lucky Matrices
28185	Shared Memory Switch
28186	Endless Road
28187	Sets May Be Good
28188	Text Editor
28189	LCSLCSLCS
28190	The Best Problem of 2021
28191	Random Interactive Convex Hull Bot
28192	Record Parity