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@ -1,4 +1,5 @@
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package tools
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//划分
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func partition(arr *[]int,left int,right int)int{
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privot:=(*arr)[right]
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@ -26,6 +27,7 @@ func QuickSort(arr *[]int,left int,right int){
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QuickSort(arr,privot+1,right)
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}
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//快速排序2
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//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
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func QuickSort2(arr *[]int,left int,right int){
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if left>= right{
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return
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@ -49,4 +51,97 @@ func QuickSort2(arr *[]int,left int,right int){
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QuickSort(arr,left,i-1)
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QuickSort(arr,i+1,right)
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}
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}
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//冒泡排序
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//比较相邻元素,较大的往右移
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func BubbleSort(arr *[]int){
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flag:=true
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lastSwapIndex:=0
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for i:=0;i<len(*arr)-1;i++{
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sortBorder:=len(*arr)-1-i
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for j:=0;j<sortBorder;j++{
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if (*arr)[j]>(*arr)[j+1]{
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temp:=(*arr)[j]
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(*arr)[j]=(*arr)[j+1]
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(*arr)[j+1]=temp
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flag=false
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lastSwapIndex=j
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}
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}
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sortBorder=lastSwapIndex
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if flag{
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break
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}
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}
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}
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//插入排序
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//将未排序部分插入到已排序部分的适当位置
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func InsertionSort(arr *[]int){
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for i:=1;i<len(*arr);i++{
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curKey:=(*arr)[i]
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j:=i-1
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for curKey<(*arr)[j]{
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(*arr)[j+1]=(*arr)[j]
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j--
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if j<0 {
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break
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}
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}
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(*arr)[j+1]=curKey
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}
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}
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//选择排序
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//选择一个最小值,再寻找比它还小的进行交换
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func SelectionSort(arr *[]int){
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for i:=0;i<len(*arr);i++{
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minIndex:=i
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for j:=i+1;j<len(*arr);j++{
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if (*arr)[j]<(*arr)[minIndex]{
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minIndex=j
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}
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}
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temp:=(*arr)[i]
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(*arr)[i]=(*arr)[minIndex]
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(*arr)[minIndex]=temp
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}
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}
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//归并排序
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//合久必分,分久必合,利用临时数组合并两个有序数组
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func MergeSort(arr *[]int,left int,right int){
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if left >= right{
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return
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}
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mid:=(left+right)/2
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MergeSort(arr,left,mid)
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MergeSort(arr,mid+1,right)
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i:=left
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j:=mid+1
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p:=0
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temp :=make([]int,right-left+1)
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for i<=mid && j<=right{
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if (*arr)[i]<=(*arr)[j]{
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temp[p]=(*arr)[i]
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i++
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}else{
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temp[p]=(*arr)[j]
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j++
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}
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p++
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}
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for i<=mid{
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temp[p]=(*arr)[i]
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i++
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p++
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}
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for j<=right{
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temp[p]=(*arr)[j]
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j++
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p++
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}
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for i=0;i<len(temp);i++{
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(*arr)[left+i]=temp[i]
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}
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}
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