What common programming structure often results in quadratic time complexity, $O(N^2)$?

Answer

Nested loops processing the entire input set against itself

Quadratic time complexity, $O(N^2)$, usually arises when an algorithm involves nested loops where both loops iterate over the input set, causing the time to quadruple when the input doubles.

What common programming structure often results in quadratic time complexity, $O(N^2)$?
efficiencycomplexityalgorithmscalinginput size