Solved by xiaowuc1

#	Title	# Solved	Avg. Tries
20990	Perfect Path Patrol	23	1.91
20991	Sky’s the Limit	3	1.33
20992	Using Digits	20	1.45
20993	Furniture	20	2.50
20994	Monochrome Points	9	2.33
21001	A Very Different Word	40	2.65
21009	Visible Trees	69	1.14
21014	Special Substring	24	1.50
21021	Prize Coupon	21	1.62
21022	Three Points for a Win	237	1.08
21023	Door of the Ancient	13	2.38
21027	Presidential Game	46	1.20
21029	Collecting Apples	12	2.58
21030	Frequent Alphabet	56	1.13
21032	Odd GCD Matching	41	1.20
21035	Simple Operations in Matrix	98	1.12
21040	Maximum Subset	54	1.72
21041	Largest Exotic Number	32	1.63
21044	Inverse Common Superstring	69	1.55
21047	Array of Discord	51	2.22
21048	Big Brother	50	1.44
21049	Coin Stacks	56	2.71
21050	Dams in Distress	40	1.78
21052	Film Critics	29	1.83
21053	Gig Combinatorics	65	1.32
21054	Hiring and Firing	15	3.00
21055	Infection Estimation	25	4.56
21056	Joining Flows	28	1.89
21057	Keep Calm And Carry Off	29	1.72
21058	Language Survey	17	5.29
21059	Methodic Multiplication	101	1.15
21089	Excluded Min	18	2.89
21098	Composite Sequence	47	2.02
21104	Miner	23	1.91
21105	New Financial Year	267	1.15
21112	Easter Gift	22	1.45
21127	Binary Supersonic Utahraptors	43	1.12
21133	N-Queen 2	242	2.93
21134	Ant Typing	41	1.93
21135	Bad Packing	38	2.58
21136	Bitonic Ordering	33	1.97
21138	Dominating Duos	41	1.59
21139	Exam Manipulation	67	1.24
21140	Exciting Tournament	7	1.57
21141	Kth Subtree	30	4.73
21142	Longest Common Subsequence	43	1.35
21143	Magic Trick	143	1.13
21144	Missing Number	120	1.53
21145	Rainbow Numbers	22	2.32
21146	Rating Problems	262	1.16

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