Solved by rudec

#	Title	# Solved	Avg. Tries
15829	Hashing	19,113	3.33
25083	새싹 STANDARD	72,571	1.89
27866	문자와 문자열 STANDARD	56,812	1.48
30802	Welcome Kit	8,437	1.85
31403	$A + B - C$	9,934	1.58

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