异或 - Problem Set - HFOJ

	ID	Problem Show tags Hide tags	AC / Tried	Difficulty
	52	P52 「一本通 2.3 例 2」The XOR Largest Pair 异或字典树	4 / 6	10
	53	P53 「一本通 2.3 例 3」Nikitosh 和异或异或字典树	4 / 8	10

Pick a problem randomly based on the current filter.