POTD_30_OCT_2024_pairs with diff k

[Varalakshmi2354]

Description

Given an array arr[] of positive integers, find and return the maximum sum of the smallest and second smallest element among all possible subarrays of size greater than one. If it is not possible, then return -1.

Fixes: #226

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Type of Change

• Question Added
• Solution Added
• Other (please specify):

Checklist

• I have performed a self-review of my code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation (if applicable).
• My changes generate no new warnings.
• I have added tests to cover my changes (if applicable).
• All new and existing tests pass.

Additional Notes

Complexity: The brute force approach has a time complexity of O(n3), making it inefficient for large arrays.

Optimized Approach: Consider using a sliding window technique or a priority queue to efficiently find the two smallest elements in each subarray, potentially reducing the time complexity to O(n2).Edge Cases: Handle arrays with fewer than two elements, since valid subarrays of size greater than one won't exist. This would lead to a return value of -1.

[github-actions]

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