USACO Training - Problem Set

	ID	Problem Show tags Hide tags	AC / Tried	Difficulty
	19	19 「一本通 1.3 练习 3」质数方阵搜索 USACO Training	1 / 1	10
	42	42 「一本通 1.4 例 2」魔板搜索 USACO Training	1 / 1	10

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