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852. Peak Index in a Mountain Array. Medium. You are given an integer mountain array arr of length n where the values increase to a peak element and then decrease. Return the index of the peak element. Your task is to solve it in O(log(n)) time complexity. Example 1: Input: arr = [0,1,0] Output: 1. Example 2: Input: arr = [0,2,1,0] Output: 1.
arr[i] > arr[i + 1] > ... > arr[arr.length - 1] Given a mountain array mountainArr, return the minimum index such that mountainArr.get(index) == target. If such an index does not exist, return -1. You cannot access the mountain array directly.
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Mar 31, 2018 · 852. Peak Index in a Mountain Array. Description. An array arr is a mountain if the following properties hold: arr.length >= 3. There exists some i 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]
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Problem Description. In this problem, we're given an array arr that represents a mountain, which means it has the shape of a peak: the elements first increase and then decrease. The constraints that define a mountain are: The length of the array should be at least 3.
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