The answer
When generating unique pairs, starting at i + 1 ensures the loop only looks forward, preventing self-pairing and avoiding duplicate mirrored pairs.
Common Mistakes When Initializing the Inner Loop Counter
Why should the inner loop counter 'j' start at 'i + 1'?
More FAQs in Common Mistakes When Initializing the Inner Loop Counter
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.
Declaring variables directly inside the for loop definition (e.g., int j = 0) ensures they are reset properly and prevents interference from other parts of the program.
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