g1601_1700.s1671_minimum_number_of_removals_to_make_mountain_array

Class Solution

java.lang.Object

g1601_1700.s1671_minimum_number_of_removals_to_make_mountain_array.Solution

public class Solution
extends Object

1671 - Minimum Number of Removals to Make Mountain Array.

Hard

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]

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 <= 1000
• 1 <= nums[i] <= 109
• It is guaranteed that you can make a mountain array out of nums.

Constructor Summary

Constructors

Constructor and Description
Solution()

Method Summary

Modifier and Type	Method and Description
int	minimumMountainRemovals(int[] nums)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Solution

public Solution()

Method Detail

minimumMountainRemovals

public int minimumMountainRemovals(int[] nums)