Running Spider-Man

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Spider-Man is running on a straight road from block $L$ to $R$. Those blocks are numbered sequentially as $L$, $L+1$, $L+2$, ..., $R-1$, $R$. As he loves even numbers, so he will become happy if the count of even-numbered blocks are more than that of odd-numbered blocks on his traveling path. Considering he can run only in forward direction & he has to cover the whole path, is it possible for him

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solution.cppC++17

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