The answer
If the inner loop starts at i + 1, the outer loop must stop at length - 1, otherwise on the last iteration, i + 1 will cause an Index Out of Bounds error.
Common Mistakes When Initializing the Inner Loop Counter
How does the outer loop limit affect the inner loop?
More FAQs in Common Mistakes When Initializing the Inner Loop Counter
When generating unique pairs, starting at i + 1 ensures the loop only looks forward, preventing self-pairing and avoiding duplicate mirrored pairs.
It should start at 0 when you are traversing multi-dimensional data, like a 2D matrix, where every row requires processing from the very first column.
The algorithm will pair the current element with itself on the first inner iteration. If summing elements, it will incorrectly add the same element twice.
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