Couple Dance

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As we all know ISM is converted into IIT. So to celebrate this ecstasy seniors decided to organize a dance concert in which couples will dance together. There are N boys and N girls numbered from 1 to N. Seniors ask them to form groups. Now some among them are failed to form groups due to some reasons but they have keen desire to participate. So seniors decided a strategy that only people of diffe

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solution.cppC++17

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