번호	제목
18600	Valentine’s Day
18601	Play Games with Rounddog
18602	Welcome Party
18603	Dense Subgraph
18604	Closest Pair of Segments
18605	Coins
18606	Block Breaker
18607	Domino Covering
18608	Make Rounddog Happy
18609	Square Root Partitioning
18610	Yet Another Convolution
18611	Money Sharing
18612	Magic Strings
18613	Decimal Expansion
18614	Cosmic Crossroads
18615	Warm Up
18616	Defying Gravity
18617	From Modular to Rational
18618	Tree Automorphisms
18619	Alakazam