Possible Arrangement of Mountains

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Khushi is a mountaineer. She and her friend, Hajra, plan to go trekking. Once they reach their destination, Hajra gives Khushi a task which is to climb all the mountains between points **A** and **B**. Khushi can go $n$ upstrokes and $n$ downstrokes but the total mountains between the two points are unknown. Khushi happily accepts the challenge. **Note:** *Upstroke & Downstroke can be in any orde

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solution.cppC++17

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