import { generateRandomArray, isSort } from "../util/index.mjs";

/**
 * 
 * @param {number[]} arr 
 */
export function shellSort(arr){
    const n = arr.length
    // 创建希尔序列,以克努特序列为例
    let gap = 1;
    while (gap < n / 3) {
        gap = gap*3 +1
    }

    while(gap>=1) {
        // 正常插入排序
        for (let i = 0;i<gap; i++){
            for(let j = i+gap;j < n;j+=gap){
                let temp = arr[j]
                while(j>0 && arr[j-gap] > temp) {
                    arr[j] = arr[j-gap]
                    j-=gap
                }
                arr[j] = temp
            }
        }
        // 正常插入排序

        gap = Math.floor(gap/3)
    }

}