不行，如果轮到了B点，那因为是directed,它也不知道A的情况，也不知道改如何继续加，或者下手。 所以，要把所有跟A有关系的点，或者接下去和A的neighbor有关系的点，都放进union-find里面，让这些点有Common parents. 之前我们不是给每个num都存好了parent了嘛。

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