#누적 합 prefix_sum

#	제목	푼 사람 수	평균 시도
20557	복잡한 쿼리	42	1.57
20558	쿼리와 수열	23	2.57
20579	Territories	8	3.88
20581	Three balls	10	3.10
20638	Universal and Existential Quantifiers	11	2.36
20648	Rectangular Pasture	159	2.06
20691	Shopping Changes	32	1.53
20780	Evil Problemsetters	9	2.44
20818	Godishalsbandet	66	1.64
20868	Fluortanten	23	1.35
20905	Exhausting Errands	7	1.86
20918	좋은 배열 세기	26	1.69
20966	Paint by Letters	10	2.60
20971	No Time to Paint	134	2.17
20984	Growing Vegetables is Fun 4	108	1.73
20985	Snowball	70	1.89
20986	Group Photo	78	1.90
20988	Dungeon 3	10	2.30
21012	Project Team	4	4.25
21014	Special Substring	24	1.50
21045	Adding Numbers	13	3.38
21135	Bad Packing	38	2.58
21187	Pulling Their Weight	19	1.05
21199	Paper Snowflakes	7	1.00
21203	Distance	46	1.61
21229	Stone Game	17	2.59
21234	Just Green Enough	104	1.74
21318	피아노 체조	1,188	2.03
21358	Klockan	5	1.20
21363	Kontringsattack	7	1.29
21421	Белоснежка и $n$ гномов	8	2.75
21492	Призы	8	2.75
21543	Массовый прогноз	1	2.00
21588	Circle of Friends	12	4.25
21620	Math Homework	11	2.45
21653	Скобки	3	1.00
21686	Таблица	2	1.00
21695	Школа танцев	11	3.45
21725	더치페이	39	2.77
21757	나누기	802	4.75
21758	꿀 따기	3,528	2.63
21762	공통 부분 수열 확장	182	3.97
21807	Autobahn	10	2.00
21808	Cigle	12	3.00
21813	Balanced Subsets	19	1.58
21886	Countdown	8	1.88
21905	Archeologists	31	1.55
21909	Divisible by 3	67	1.25
21910	Fence Job	24	1.46
21921	블로그	5,485	2.41

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