Computer Science – Data Structures and Algorithms
Scientific paper
1996-08-22
Random Structures Algorithms 10 (1997), no. 1-2, 125--142
Computer Science
Data Structures and Algorithms
Scientific paper
A perturbation technique can be used to simplify and sharpen A. C. Yao's
theorems about the behavior of shellsort with increments $(h,g,1)$. In
particular, when $h=\Theta(n^{7/15})$ and $g=\Theta(h^{1/5})$, the average
running time is $O(n^{23/15})$. The proof involves interesting properties of
the inversions in random permutations that have been $h$-sorted and $g$-sorted.
Janson Svante
Knuth Donald E.
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