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96 lines
2.7 KiB
JavaScript
96 lines
2.7 KiB
JavaScript
/*
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* @Description: 希尔排序
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* @Version: Beta1.0
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* @Author: 【B站&公众号】Rong姐姐好可爱
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* @Date: 2020-02-21 08:07:13
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* @LastEditors: 【B站&公众号】Rong姐姐好可爱
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* @LastEditTime: 2021-03-28 11:37:29
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*/
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/**
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*
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* 数组的希尔排序
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* - 返回已排序的数组，从小到大
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* @param {Array} arr 待排序数组
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* @param {int} len 数组长度，可校验
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* @returns
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*/
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function shellSort(arr, len) {
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// 校对数组长度
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len = arr.length === len ? len : arr.length
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// 注意处理浮点【向上取整】 防止空指针
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for (let increment = Math.floor(len / 2); increment >= 1; increment = Math.floor(increment / 2)) {
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// 对每组数据，进行直接排序
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for (let groupIndex = 0; groupIndex < increment; ++groupIndex) {
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specialStraightInsertSort(arr, len, increment, groupIndex)
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}
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}
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return arr
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}
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/**
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* 根据希尔排序的步长对分组进行直接插入排序处理
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* @param {Array} arr 排序数组
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* @param {int} len 数组长度
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* @param {int} increment 增量步长
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* @param {int} groupIndex 分组，第几个分组
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*/
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function specialStraightInsertSort(arr, len, increment, groupIndex) {
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len = arr.length === len ? len : arr.length
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console.log(`数组长度：${len}----->当前步长：${increment}---->分组：${groupIndex}`)
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for (let eleStartIndex = groupIndex + increment; eleStartIndex < len; eleStartIndex += increment) {
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// 此时eleStartIndex为直接插入排序的比较元素
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// 直接插入排序中的哨兵元素【重要】
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const temp = arr[eleStartIndex]
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let j
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// 向前比较 从小到大
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for (j = eleStartIndex - increment; j >= 0 && arr[j] > temp; j -= increment) {
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arr[j + increment] = arr[j]
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}
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arr[j + increment] = temp
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}
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console.log('specialStraightInsertSort处理后：', arr)
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return arr
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}
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const dealArr = [5, 8, 2, 16, 3, 9, 1]
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console.log('插入排序前：', dealArr)
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const sortResult = shellSort(dealArr, 7)
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console.log('插入排序后：', sortResult)
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/**
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* 简化的希尔排序
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* - 返回已排序号的数组，从小到大
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* @param {Array} arr
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* @returns
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*/
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function shellSortBetter(arr) {
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const len = arr.length
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let increment = Math.floor(len / 2)
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while (increment !== 0) {
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for (let i = increment; i < len; i++) {
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const temp = arr[i]
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for (let j = i - increment; j >= 0 && temp < arr[j]; j -= increment) {
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arr[j + increment] = arr[j]
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}
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arr[i + increment] = temp
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}
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increment = Math.floor(increment / 2)
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}
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return arr
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}
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console.log('简化shellSortBetter希尔排序前：', dealArr)
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const sortResultBetter = shellSortBetter(dealArr)
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console.log('简化shellSortBetter希尔排序后：', sortResultBetter)
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