Solved by pyb0987

#	Title	# Solved	Avg. Tries
15650	N과 M (2) STANDARD	49,319	1.35
15651	N과 M (3) STANDARD	40,228	1.50
15652	N과 M (4) STANDARD	41,509	1.27
18870	좌표 압축	37,025	2.50

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