Solved by anhwakim

#	Title	# Solved	Avg. Tries
17144	미세먼지 안녕!	17,256	1.80
17404	RGB거리 2	9,584	1.67
18870	좌표 압축	36,950	2.50
25083	새싹 STANDARD	75,960	1.88
27866	문자와 문자열 STANDARD	61,182	1.48
30802	Welcome Kit	10,635	1.87
30805	Lexicographically Largest Common Subsequence	1,365	3.19
31403	$A + B - C$	12,256	1.59

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