번호	제목
19321	Longest Increasing Subsequence
19322	Median
19323	Dogs
19324	Three Arrays
19325	Expected Shopping
19326	Cover the Paths
19327	Elevator
19328	Code-Cola Plants
19329	GCD
19330	Berland Post
19331	Compressed Spanning Subtrees
19332	Prefix-free Queries
19333	Subsequence Sum Queries
19334	Consistent Occurrences
19335	Increasing Costs
19336	Mines
19337	Balls
19338	Flip a Coin
19339	Octagons
19340	Tree Paths