LeetCode 2599: Make the Prefix Sum Non-negative Solution

Master LeetCode problem 2599 (Make the Prefix Sum Non-negative), 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.

2599. Make the Prefix Sum Non-negative

Medium

Array Greedy Heap (Priority Queue)

Problem Explanation

Explanation:

Given an array of integers, we need to make the prefix sum non-negative by modifying some elements. We can achieve this by iterating through the array and adjusting the values to ensure that the prefix sum remains non-negative.

Algorithm:

Initialize a variable prefixSum to keep track of the cumulative sum of the array elements.
Iterate through the array and for each element:
- If the prefixSum + current element is negative, calculate the minimum value needed to make it non-negative.
- Update the current element with the calculated minimum value.
- Update the prefixSum with the modified element.
Return the modified array.

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

Solution Code

public int[] makeNonNegativePrefixSum(int[] nums) {
    int prefixSum = 0;
    for (int i = 0; i < nums.length; i++) {
        if (prefixSum + nums[i] < 0) {
            nums[i] = Math.abs(prefixSum);
        }
        prefixSum += nums[i];
    }
    return nums;
}

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