参考:https://baike.baidu.com/item/%E5%B8%8C%E5%B0%94%E6%8E%92%E5%BA%8F/3229428?fr=aladdin
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func shellSort(arr []int) { length := len(arr) for step := length / 2; step > 0; step /= 2 { for i := step; i < length; i += step { for j := i; j >= 0; j -= step { if j > 0 && arr[j] < arr[j-step] { arr[j-step], arr[j] = arr[j], arr[j-step] } } } } }
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