mediumArraysPattern: Alternating sum subarray
Alternating Sum Subarray Maximum Solution
Problem Statement
Given an array of integers, find the maximum sum of a subarray where the signs of the elements alternate, ending with either a positive or negative value.
Examples
Example 1:
Input:[1, -2, 3, -4, 5]
Output:12
Explanation: The subarray [1, -2, 3, -4, 5] has alternating signs and the maximum sum.
Example 2:
Input:[-1, 2, -3, 4, -5]
Output:12
Explanation: The subarray [-1, 2, -3, 4, -5] has alternating signs and the maximum sum.
Constraints
- Input array will have at least one element and at most 100 elements.
- Each element in the array will be an integer between -1000 and 1000.
Time: O(N) Space: O(1)
Analyze constraints and compute optimal solutions step-by-step.
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