数组

2021-07-09
排序

桶排序

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/**
 * @description 桶排序
 * @author ZhangYu
 * @date 09/07/2021
 * @param {number[]} arr
 * @return {*}  {number[]}
 */
function sort(arr: number[]): number[] {
  const countArr = Array.from({ length: 11 }).fill(0) as number[]
  arr.forEach(v => {
    countArr[v]++
  })
  const res: number[] = []
  countArr.forEach((v, i) => {
    if (v) {
      for (let j = 0; j < v; j++) {
        res.unshift(i)
      }
    }
  })
  return res
}

冒泡排序

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/**
 * @description 冒泡排序
 * @author ZhangYu
 * @date 10/07/2021
 * @param {number[]} arr
 * @return {*}  {number[]}
 */
function bubbleSort(arr: number[]): number[] {
  for (let i = 0; i < arr.length; i++) {
    for (let j = i; j < arr.length - 1; j++) {
      if (arr[i] > arr[j + 1]) {
        [arr[i], arr[j + 1]] = [arr[j + 1], arr[i]]
      }
    }
  }
  return arr
}

快速排序

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/**
 * @description 快速排序
 * @author ZhangYu
 * @date 10/07/2021
 * @param {number[]} arr
 * @return {*}  {number[]}
 */
function quickSort(arr: number[]): number[] {
  let len = arr.length
  let jizhunNum: number | null = null
  const leftArr: number[] = []
  const rightArr: number[] = []

  if (len <= 1) return arr

  jizhunNum = arr.splice(0, 1)[0]
  len -= 1

  for (let i = 0; i < len; i++) {
    const num = arr[i]
    if (num > jizhunNum) {
      rightArr.push(num)
    } else {
      leftArr.push(num)
    }
  }

  return [...quickSort(leftArr), jizhunNum, ...quickSort(rightArr)]
}
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