Half Sequence

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### Read problems statements in [Russian](https://www.codechef.com/download/translated/COOK133/russian/HFSEQ.pdf). Chef has an array $A$ of size $N$. Chef wants to choose any subsequence of size **exactly** $ \lceil \frac{N}{2} \rceil$ from the array such that GCD of all the elements in that sequence must be $2$. Chef names such a kind of sequence as a *half-sequence*. Help Chef to find wheth

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solution.cppC++17

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