USACO Training - Problem Set - 美力程青少儿编程

	ID	Problem Show tags Hide tags	AC / Tried	Difficulty
	1047	P1047 「一本通 1.3 练习 3」质数方阵搜索 USACO Training	2 / 3	10
	1050	P1050 「一本通 1.4 例 2」魔板搜索 USACO Training	1 / 2	10

Pick a problem randomly based on the current filter.