Optimal Gap Sequences in Shellsort for $n\leq16$ Elements
Optimal Gap Sequences in Shellsort for $n\leq16$ Elements
复制标题
$nleq16$ 元素的希尔排序中的最优间隙序列
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发表时间:
2021
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通讯作者:
Ying Wai Lee
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作者:
Ying Wai Lee
Optimal gap sequences in Shellsort, defined as gap sequences having the minimised maximum number of comparisons for a fixed number of pairwise distinct elements, are found by minimax search in reduced permutational spaces, namely Bad (s, 1)-sorted permutations. Exact optimal gap sequences in Shellsort for n ≤ 16 pairwise distinct elements are established, and the best known gap sequences for 17 ≤ n ≤ 30 are listed with conjectures made. It notably discovers some optimal gap sequences consist of increments larger than the half of the total number of the elements to sort.
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