Longest Mountain in Array at TikTok

Problem Description

You may recall that an array `arr` is a **mountain array** if and only if: * `arr.length >= 3` * There exists some index `i` (**0-indexed**) with `0 < i < arr.length - 1` such that: * `arr[0] < arr[1] < ... < arr[i - 1] < arr[i]` * `arr[i] > arr[i + 1] > ... > arr[arr.length - 1]` G...

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