The answer
Use a nested loop where the outer loop tracks index 'i', and the inner loop starts at index 'j = i + 1'.
Using Nested Loops for Generating Pairs
How do I generate unique pairs from an array?
More FAQs in Using Nested Loops for Generating Pairs
It ensures you do not pair an element with itself, and it prevents generating redundant, mirrored pairs (e.g., checking [0,1] and then [1,0]).
Although the inner loop shrinks, the overall time complexity is still bounded by O(N^2) Quadratic Time.
Yes. For problems like Two Sum, utilizing a Hash Map allows you to check for complementary pairs in O(N) linear time.
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