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sorts.go 2.73 KB
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szmaozi authored 2021-09-02 13:41 . wip: merge biob-v1
package utils
//划分
func partition(arr *[]int, left int, right int) int {
privot := (*arr)[right]
i := left - 1
for j := left; j < right; j++ {
if (*arr)[j] < privot {
i++
temp := (*arr)[i]
(*arr)[i] = (*arr)[j]
(*arr)[j] = temp
}
}
temp := (*arr)[i+1]
(*arr)[i+1] = (*arr)[right]
(*arr)[right] = temp
return i + 1
}
//递归
func QuickSort(arr *[]int, left int, right int) {
if left >= right {
return
}
privot := partition(arr, left, right)
QuickSort(arr, left, privot-1)
QuickSort(arr, privot+1, right)
}
//快速排序2
//找到一个基准,左边是所有比它小的,右边是比它大的,分别递归左右
func QuickSort2(arr *[]int, left int, right int) {
if left >= right {
return
}
privot := (*arr)[left]
i := left
j := right
for i < j {
for i < j && (*arr)[j] > privot {
j--
}
for i < j && (*arr)[i] <= privot {
i++
}
temp := (*arr)[i]
(*arr)[i] = (*arr)[j]
(*arr)[j] = temp
}
(*arr)[left] = (*arr)[i]
(*arr)[i] = privot
QuickSort(arr, left, i-1)
QuickSort(arr, i+1, right)
}
//冒泡排序
//比较相邻元素,较大的往右移
func BubbleSort(arr *[]int) {
flag := true
lastSwapIndex := 0
for i := 0; i < len(*arr)-1; i++ {
sortBorder := len(*arr) - 1 - i
for j := 0; j < sortBorder; j++ {
if (*arr)[j] > (*arr)[j+1] {
temp := (*arr)[j]
(*arr)[j] = (*arr)[j+1]
(*arr)[j+1] = temp
flag = false
lastSwapIndex = j
}
}
sortBorder = lastSwapIndex
if flag {
break
}
}
}
//插入排序
//将未排序部分插入到已排序部分的适当位置
func InsertionSort(arr *[]int) {
for i := 1; i < len(*arr); i++ {
curKey := (*arr)[i]
j := i - 1
for curKey < (*arr)[j] {
(*arr)[j+1] = (*arr)[j]
j--
if j < 0 {
break
}
}
(*arr)[j+1] = curKey
}
}
//选择排序
//选择一个最小值,再寻找比它还小的进行交换
func SelectionSort(arr *[]int) {
for i := 0; i < len(*arr); i++ {
minIndex := i
for j := i + 1; j < len(*arr); j++ {
if (*arr)[j] < (*arr)[minIndex] {
minIndex = j
}
}
temp := (*arr)[i]
(*arr)[i] = (*arr)[minIndex]
(*arr)[minIndex] = temp
}
}
//归并排序
//合久必分,分久必合,利用临时数组合并两个有序数组
func MergeSort(arr *[]int, left int, right int) {
if left >= right {
return
}
mid := (left + right) / 2
MergeSort(arr, left, mid)
MergeSort(arr, mid+1, right)
i := left
j := mid + 1
p := 0
temp := make([]int, right-left+1)
for i <= mid && j <= right {
if (*arr)[i] <= (*arr)[j] {
temp[p] = (*arr)[i]
i++
} else {
temp[p] = (*arr)[j]
j++
}
p++
}
for i <= mid {
temp[p] = (*arr)[i]
i++
p++
}
for j <= right {
temp[p] = (*arr)[j]
j++
p++
}
for i = 0; i < len(temp); i++ {
(*arr)[left+i] = temp[i]
}
}
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