LeetCode 3224: Minimum Array Changes to Make Differences Equal Solution

Master LeetCode problem 3224 (Minimum Array Changes to Make Differences Equal), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

3224. Minimum Array Changes to Make Differences Equal

Medium

Array Hash Table Prefix Sum

Problem Explanation

Explanation:

To solve this problem, we need to find the minimum number of changes required to make the absolute difference between corresponding elements in the array equal. We can achieve this by iterating through the array and adjusting elements as needed.

Initialize a counter variable to keep track of the number of changes needed.
Iterate through the first half of the array.
For each element, calculate the target value by taking the absolute difference between the element and its corresponding element in the second half of the array.
Update the element if it is not within the range [target-k, target+k].
Increment the counter for each update made.
The final counter value gives the minimum number of changes required.

Solution Code

class Solution {
    public int minChanges(int[] nums, int k) {
        int n = nums.length;
        int[] counter = new int[k];
        
        for (int i = 0; i < n / 2; i++) {
            int target = Math.abs(nums[i] - nums[n - i - 1]);
            counter[target]++;
        }
        
        int changes = 0;
        for (int i = 0; i < k; i++) {
            changes += counter[i] - Math.min(counter[i], n / 2 - counter[i]);
        }
        
        return changes;
    }
}

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