I was trying to solve this problem in Egyptian ECPC but I couldn't. Can anyone give me a hint ?

someone who already solved it said that he use disjoint set but I couldn't handle it using disjoint set .

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I was trying to solve this problem in Egyptian ECPC but I couldn't. Can anyone give me a hint ?

someone who already solved it said that he use disjoint set but I couldn't handle it using disjoint set .

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