번호	제목
27473	이상한 판 뒤집기 게임
27474	팬케이크 탑
27475	Cancel the Trains
27476	Suffix Operations
27477	Triangles
27478	Checkpoints
27479	Dog Snacks
27480	Even Harder
27481	Hotelier
27482	Block Adventure
27483	Round Corridor
27484	White Lines
27485	Compress Words
27486	Graph Traveler
27487	One and Two
27488	Sum of Two Numbers
27489	Matching Numbers
27490	Moving Dots
27491	Sum Over Zero
27492	XOR, Tree, and Queries