Solved by codingcloud

#	Title	# Solved	Avg. Tries
15650	N과 M (2) STANDARD	48,218	1.35
15651	N과 M (3) STANDARD	39,442	1.49
15652	N과 M (4) STANDARD	40,604	1.27
18870	좌표 압축	35,982	2.51

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