Team Formation For Snackdown

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There are n people who want to take part in SnackDown. In the competition in this problem, a team should consist of exactly two people (as opposed to the real contest, where single-member teams are allowed). Of course, a person can only participate in a single team. Out of these, 2 * m people have already formed their teams, i.e. there are m teams already formed. The remaining people want to parti

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solution.cppC++17

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