My Fair Coins

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There are coins of $2$ different denominations in Crazyland, $1$-cent coins and $2$-cent coins. They have two faces - heads and tails. Your task is to find out the the number of ways to create a linear arrangement of these coins so that their sum is $N$ cents. The only condition on the linear arrangement is that the first coin in the arrangement should always have heads up. All other coins could

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solution.cppC++17

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