入门题-输入输出 - Problem Set - Hydro

	ID	Problem Show tags Hide tags	AC / Tried	Difficulty
	828	828 圆的面积入门题-输入输出	0 / 0	(None)
	829	829 歌手打分入门题-输入输出	0 / 0	(None)

Pick a problem randomly based on the current filter.