Solved by mg1135

#	Title	# Solved	Avg. Tries
2557	Hello World STANDARD	362,844	2.54
2738	행렬 덧셈	51,321	1.89
5597	Who have not handed in ?	70,275	1.94
10807	개수 세기 STANDARD	86,372	1.62
10813	공 바꾸기	50,047	1.58
10871	X보다 작은 수 STANDARD	158,396	1.84

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