Ross Rachel

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Rachel and Monica are playing a game. Monica gives Rachel N coins numbered from 1 to N, and all the coins are facing in "Same direction" (Either Head or Tail), which will be decided by Monica. Rachel needs to play N rounds.In the k-th round Rachel will flip the face of all the coins whose number is less than or equal to k. That is, the face of the coin i will be reversed, from Head to Tail, or,

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solution.cppC++17

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