#depth-first search dfs

#	Title	# Solved	Avg. Tries
6383	SPF	24	2.54
6451	Alien Security	5	4.60
6561	Decode the Tree	2	9.50
6584	The Settlers of Catan	23	1.70
6649	Tree Insertions	5	1.40
6659	All Friends	2	5.00
6743	Rectangle Cutting	9	1.00
6747	Median Weight Bead	19	1.53
6753	Chances of winning	18	1.22
6755	Who is taller?	48	2.17
6759	LHC	7	1.29
6772	Choose Your Own Arithmetic	15	3.87
6832	Maze	58	2.03
6837	Herding	16	1.75
6847	Friends	22	1.59
6879	Pyramid Message Scheme	3	1.67
6881	Number Matrix	62	2.89
6907	Floor Plan	32	3.25
6945	Surfing	2	11.50
6948	Subsets	18	1.72
6984	All Roads Lead Where?	40	1.30
7088	Word counting	8	1.63
7139	Toll	39	2.36
7149	Can of Worms	29	3.07
7166	Värvipalett	1	10.00
7191	Turning a Tree	4	2.75
7198	Tähekabe	4	2.00
7228	Melagiai	9	1.00
7234	Unter	4	7.75
7299	Food Cubes	26	2.15
7352	Sorting It All Out	12	1.75
7535	A Bug’s Life	203	2.06
7644	Highway Construction	22	2.73
7669	Go	27	1.15
7812	Tree Median	535	2.85
7827	Transitive Closure	64	2.05
7858	Tetris Alphabet	7	2.43
7919	Strażak	1	9.00
7993	East-West	26	5.85
8063	Three-Coloring of Binary Trees	9	1.33
8075	Word Equations	7	6.29
8110	Trees	13	2.23
8119	Polygon	14	2.07
8121	Step Traversing a Tree	34	1.65
8128	Subway	45	6.42
8142	Ridges and Valleys	52	1.81
8184	Guilds	45	2.31
8233	Minimalist Security	20	6.15
8265	Plecak	3	2.00
8314	Acyclic Decomposition	52	3.35

123456781117