LeetCode 3422: Minimum Operations to Make Subarray Elements Equal Solution

Master LeetCode problem 3422 (Minimum Operations to Make Subarray Elements 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.

3422. Minimum Operations to Make Subarray Elements Equal

Medium

Array Hash Table Math Sliding Window Heap (Priority Queue)

Problem Explanation

Explanation:

To solve this problem, we need to find the minimum number of operations required to make all elements of a subarray equal. We can achieve this by iterating through the elements and calculating the operations needed to make each element equal to the median of the subarray. The median is the element at position (n + 1) / 2 in a sorted array.

Here are the steps:

Sort the subarray.
Calculate the median element.
Iterate through the subarray and calculate the operations needed to make each element equal to the median.
Return the sum of operations.

Time complexity: O(n log n) where n is the size of the subarray due to sorting. Space complexity: O(n) for storing the sorted subarray. :

Solution Code

class Solution {
    public int minOperations(int[] nums, int limit) {
        int n = nums.length;
        int[] ops = new int[2 * limit + 2];
        
        for (int i = 0; i < n / 2; i++) {
            int sum = nums[i] + nums[n - i - 1];
            ops[2] += 2;
            ops[Math.min(nums[i], nums[n - i - 1]) + 1]--;
            ops[sum]--;
            ops[sum + 1]++;
            ops[Math.max(nums[i], nums[n - i - 1]) + limit + 1]++;
        }
        
        int res = Integer.MAX_VALUE;
        int curr = 0;
        
        for (int i = 2; i <= 2 * limit; i++) {
            curr += ops[i];
            res = Math.min(res, curr);
        }
        
        return res;
    }
}

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