Solved by lego0901

#	Title	# Solved	Avg. Tries
27981	압도적 XOR 수	59	1.98
27982	Pile of Cubes	241	1.76
27983	Ribbons (Easy)	280	1.78
27984	Joker	21	3.24
27985	Mentoring Matching	43	1.98
27986	Another Constructive Problem	132	1.82
27987	Prevent Cheating	26	3.19
27988	Ribbons (Hard)	66	2.79

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