LeetCode 2111: Minimum Operations to Make the Array K-Increasing Solution

Master LeetCode problem 2111 (Minimum Operations to Make the Array K-Increasing), a hard 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.

2111. Minimum Operations to Make the Array K-Increasing

Hard

Array Binary Search

Problem Explanation

Explanation

To solve this problem, we can iterate through the array and keep track of the maximum valid value that can be assigned to each element to maintain the K-increasing property. If the current element is less than or equal to the maximum valid value, we update the maximum valid value to the current element. Otherwise, we need to increment the count of operations needed and update the current element to the maximum valid value + 1.

At the end of the iteration, the total count of operations needed will be the answer.

Time complexity: O(n)
Space complexity: O(1)

Solution Code

class Solution {
    public int minOperations(int[] arr, int k) {
        int operations = 0;
        int maxVal = 0;
        
        for (int i = 0; i < arr.length; i++) {
            if (arr[i] <= maxVal) {
                maxVal = Math.max(maxVal, arr[i]);
            } else {
                operations += arr[i] - maxVal;
                maxVal = arr[i];
            }
        }
        
        return operations;
    }
}

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