【算法】【排序】希爾排序

核心思想

爲解決插入排序的最壞情況問題，希爾排序通過一個增量序列先保證區間有序將最壞情況優化掉
注意增量序列必須保證第n個和第n+1互質

算法實現

• Java版

    public static int[] sort(int[] data) {
        int length = data.length;
        int h = 1;
        while (h < length / 3) {
            h = 3 * h + 1;
        }
        while (h >= 1) {
            for (int i = h; i < length; i += h) {
                int right = data[i];
                int left = i - h;

                while (left >= 0 && data[left] > right) {
                    data[left + h] = data[left];
                    left -= h;
                }
                data[left + h] = right;
            }
            h /= 3;
        }
        return data;
    }