Solved by hamund2020

#	Title	# Solved	Avg. Tries
2557	Hello World STANDARD	350,042	2.54
5597	Who have not handed in ?	64,508	1.94
10807	개수 세기 STANDARD	79,194	1.62
10871	X보다 작은 수 STANDARD	151,611	1.84

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