Solved by ychangseok

#	Title	# Solved	Avg. Tries
20575	Buffon's Needle	62	2.16
20670	미스테리 싸인	146	2.08
20673	Covid-19	1,402	1.92
20674	Statistics	253	1.19
20717	Modular Reverse Engineering	18	5.39
20751	Barsik	53	2.17
20761	Alloys	70	3.00
20833	Kuber	1,179	1.15
20839	Betygsättning	905	1.95
20841	Skolavslutningen	15	2.60
20856	Tunnelbaneplatser	23	1.26
20867	Rulltrappa	767	1.54
20877	Minigolf	207	1.20
20909	Impressive Integers	28	2.96
20920	영단어 암기는 괴로워	8,564	2.21
20921	그렇고 그런 사이	622	1.73
20924	트리의 기둥과 가지	641	3.08
20925	메이플스토리	201	3.06
20937	떡국	656	2.19
20941	성싶당	119	2.55
20943	카카오톡	228	3.72
20944	팰린드롬 척화비	1,651	1.22
20946	합성인수분해	304	4.70
20949	효정과 새 모니터	397	1.80
20953	고고학자 예린	392	2.71
20974	Even More Odd Photos	358	1.89
20976	2 番目に大きい整数 (The Second Largest Integer)	1,756	1.17
20977	JOI ソート (JOI Sort)	257	1.17
20978	共通要素 (Common Elements)	150	1.29
21010	Slow Down	15	2.53
21022	Three Points for a Win	230	1.08
21044	Inverse Common Superstring	63	1.51
21049	Coin Stacks	55	2.73
21057	Keep Calm And Carry Off	28	1.68
21059	Methodic Multiplication	99	1.16
21081	Wandering	36	1.31
21094	Discrete Logarithm is a Joke	85	1.12
21105	New Financial Year	242	1.13
21133	N-Queen 2	233	2.97
21146	Rating Problems	252	1.16
21149	Unread Messages	43	2.16
21167	Curve Speed	213	2.00
21176	Smoothie Stand	53	1.68
21180	Reconstruct Sum	122	1.35
21184	New Maths	20	1.90
21185	Some Sum	634	1.68
21194	Meditation	153	1.21
21197	Stopwatch	292	1.15
21205	Vaccine Efficacy	44	1.59
21212	Cakes	371	1.14

1304555575859606163667285