Solved by bsw0478

#	Title	# Solved	Avg. Tries
27323	직사각형	22,871	1.14
27866	문자와 문자열 STANDARD	57,801	1.48
28278	스택 2	13,240	2.71
28279	덱 2	7,705	2.00
30328	Java Warriors	2,016	1.10
31009	진주로 가자! (Easy)	723	1.51
31403	$A + B - C$	10,484	1.58

12456