Solved by anhwakim

#	Title	# Solved	Avg. Tries
15663	N과 M (9) STANDARD	19,452	2.03
18870	좌표 압축	36,152	2.51
25083	새싹 STANDARD	74,670	1.88
27866	문자와 문자열 STANDARD	59,518	1.48
30802	Welcome Kit	9,722	1.87
31403	$A + B - C$	11,290	1.59

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