Package g2101_2200.s2170_minimum_operations_to_make_the_array_alternating

Class Solution

java.lang.Object
g2101_2200.s2170_minimum_operations_to_make_the_array_alternating.Solution
public class Solution extends java.lang.Object
2170 - Minimum Operations to Make the Array Alternating.

Medium

You are given a 0-indexed array nums consisting of n positive integers.

The array nums is called alternating if:

  • nums[i - 2] == nums[i], where 2 <= i <= n - 1.
  • nums[i - 1] != nums[i], where 1 <= i <= n - 1.

In one operation , you can choose an index i and change nums[i] into any positive integer.

Return the minimum number of operations required to make the array alternating.

Example 1:

Input: nums = [3,1,3,2,4,3]

Output: 3

Explanation:

One way to make the array alternating is by converting it to [3,1,3, 1 , 3 , 1 ].

The number of operations required in this case is 3.

It can be proven that it is not possible to make the array alternating in less than 3 operations.

Example 2:

Input: nums = [1,2,2,2,2]

Output: 2

Explanation:

One way to make the array alternating is by converting it to [1,2, 1 ,2, 1 ].

The number of operations required in this case is 2.

Note that the array cannot be converted to [2 ,2,2,2,2] because in this case nums[0] == nums[1] which violates the conditions of an alternating array.

Constraints:

  • 1 <= nums.length <= 105
  • 1 <= nums[i] <= 105

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

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

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • minimumOperations

      public int minimumOperations(int[] nums)