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Exactly, this just compares 'neighbors' i.e. numbers at consecutive indices (i, i+1)...that's a set of O(n) whereas the set of all possible pairs (given by, for example, set([i, i for i in range(n)]).symmetric_difference(itertools.product(a, a)) is O(n^2)
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Minimum Absolute Difference in an Array
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Exactly, this just compares 'neighbors' i.e. numbers at consecutive indices (i, i+1)...that's a set of O(n) whereas the set of all possible pairs (given by, for example, set([i, i for i in range(n)]).symmetric_difference(itertools.product(a, a)) is O(n^2)