Solved by ctgcsh9600

#	Title	# Solved	Avg. Tries
1890	Jump The Board!	13,707	3.20
9012	Parenthesis	81,949	2.15
14888	연산자 끼워넣기	36,815	2.12
15552	빠른 A+B STANDARD	133,041	2.20

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