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	Problem ID	Title	Source/Category	Solved	Submit
	1849	珠心算测验	NOIP普及组-20	58	146
	1850	比例简化	NOIP普及组-20	1	1
	1851	螺旋矩阵	NOIP普及组-20	0	0
	1852	子矩阵	NOIP普及组-20	0	0