Solved by seemaster300

#	Title	# Solved	Avg. Tries
27440	1로 만들기 3	341	3.03
27866	문자와 문자열 STANDARD	57,474	1.48
30802	Welcome Kit	8,750	1.86
31395	Number of Sorted Contiguous Subsequences	556	2.05
31403	$A + B - C$	10,292	1.58

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