You may recall that an array arr is a mountain array if and only if:
arr.length >= 3i (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]Given an integer array nums, return the minimum number of elements to remove to make nums a mountain array.
+
Example 1:
+ ++Input: nums = [1,3,1] +Output: 0 +Explanation: The array itself is a mountain array so we do not need to remove any elements. ++ +
Example 2:
+ ++Input: nums = [2,1,1,5,6,2,3,1] +Output: 3 +Explanation: One solution is to remove the elements at indices 0, 1, and 5, making the array nums = [1,5,6,3,1]. ++ +
+
Constraints:
+ +3 <= nums.length <= 10001 <= nums[i] <= 109nums.