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LeetCode 2598: Smallest Missing Non-negative Integer After Operations Solution

Master LeetCode problem 2598 (Smallest Missing Non-negative Integer After Operations), 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.

2598. Smallest Missing Non-negative Integer After Operations

Medium
ArrayHash TableMathGreedy

Problem Explanation

Explanation:

To solve this problem, we need to determine the maximum MEX (Minimum Excluded) value that can be achieved after applying the given operations on the input array nums. The MEX of an array is the smallest non-negative integer that does not exist in the array.

  1. We can start by sorting the array nums.
  2. Initialize a variable mex to 0 which represents the current minimum excluded value.
  3. Iterate over the sorted array nums and for each element:
    • If the element is greater than or equal to mex, increment mex by 1.
    • Otherwise, continue to the next element.
  4. After iterating through all elements, the final value of mex will be the maximum MEX achievable.

:

Solution Code

class Solution {
    public int maxMex(int[] nums, int value) {
        Arrays.sort(nums);
        int mex = 0;

        for (int num : nums) {
            if (num >= mex) {
                mex++;
            }
        }

        return mex;
    }
}

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