The cost of cyclic permutations and remainder sums in the Euclidean algorithm

preprint2026arXivOpen access

Abstract

We discuss a modification to the Gries-Mills block swapping scheme for in-place rotation with average costs of 1.85 moves per element and worst case performance still at 3 moves per element. Analysis of the average case relies on the asymptotic behavior of the sum of remainders in the Euclidean algorithm.

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