An array arr is a mountain if the following properties hold:
arr.length >= 3i with 0 < i < arr.length - 1 such that:\n\tarr[0] < arr[1] < ... < arr[i - 1] < arr[i] arr[i] > arr[i + 1] > ... > arr[arr.length - 1]Given a mountain array arr, return the index i such that arr[0] < arr[1] < ... < arr[i - 1] < arr[i] > arr[i + 1] > ... > arr[arr.length - 1].
You must solve it in O(log(arr.length)) time complexity.
\n
Example 1:
\n\n\nInput: arr = [0,1,0]\nOutput: 1\n\n\n
Example 2:
\n\n\nInput: arr = [0,2,1,0]\nOutput: 1\n\n\n
Example 3:
\n\n\nInput: arr = [0,10,5,2]\nOutput: 1\n\n\n
\n
Constraints:
\n\n3 <= arr.length <= 1050 <= arr[i] <= 106arr is guaranteed to be a mountain array.Compiled with clang 11 using the latest C++ 20 standard.
Your code is compiled with level two optimization (-O2). AddressSanitizer is also enabled to help detect out-of-bounds and use-after-free bugs.
Most standard library headers are already included automatically for your convenience.
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