Golang語言常用演算法

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在學習golang語言,文檔看的實在是乏味,就想著把常用的演算法做個實現,邊寫變學習,想來效果還是不錯的!

1. 堆排序

package mainimport "fmt"func buildHeap(array []int, length int) {        var i, j int;        for i = 1; i < length; i = i + 1 {            for j = i; j > 0 && array[j] > array[(j-1)/2]; j = (j - 1)/2  {                array[j], array[(j-1)/2] = array[(j-1)/2], array[j]              }        }    }func heapSort(array []int, length int) {        array[0], array[length - 1] = array[length - 1], array[0]        if length <= 2 {            return        }        i, j:= 0, 0        for  {            j = 2 * i + 1            if j + 1 < length - 1 {                if array[j] < array[j + 1] {                    j = j + 1                }            } else if j >= length -1 {                break            }                array[i], array[j] = array[j], array[i]            i = j        }        heapSort(array, length - 1)    }func main() {        primes := [6]int{3, 11, 5, 2, 13, 7}        fmt.Println("orginal", primes)        buildHeap(primes[:], len(primes))        fmt.Println("Max heap", primes)        heapSort(primes[:], len(primes))        fmt.Println("after sorting", primes)}    /**        out:            orginal [3 11 5 2 13 7]            Max heap [13 11 7 2 3 5]            after sorting [2 3 5 7 11 13]    **/

2.冒泡排序

package mainimport "fmt"func BubbleSort(vector []int) {    fmt.Println("BubbleSort")    fmt.Println(vector)    for i := 0; i < len(vector); i++ {        tag := true // 為了剪枝        // 每一趟將最大的數冒泡        for j := 0; j < len(vector)-i-1; j++ {            if vector[j] > vector[j+1] { /*vector[j] < vector[j+1]*/                temp := vector[j]                vector[j] = vector[j+1]                vector[j+1] = temp                tag = false            }        }        if tag {            break //0~len(vector)-i沒有發生交換說明已經有序        }        fmt.Println(vector)    }}func main() {        primes := [6]int{3, 11, 5, 2, 13, 7}        fmt.Println("orginal", primes)           BubbleSort(primes[:])        fmt.Println("after sorting", primes)}  /**    out:        orginal [3 11 5 2 13 7]        BubbleSort        [3 11 5 2 13 7]        [3 5 2 11 7 13]        [3 2 5 7 11 13]        [2 3 5 7 11 13]        after sorting [2 3 5 7 11 13]  **/

3. 插入排序

package mainimport "fmt"func InsertSort(vector []int) {    fmt.Println("InsertSort")    fmt.Println(vector)    for i := 1; i < len(vector); i++ {        // 每一趟不滿足條件就選擇i為哨兵儲存,將哨兵插入0~i-1有序序列(0~i-1始終是有序的)        if vector[i] < vector[i-1] { /*vector[i] > vector[i-1]*/            temp := vector[i]            //後移直到找到哨兵合適的位置            j := i - 1            for ; j >= 0 && vector[j] > temp; j-- { /*vector[j] < temp*/                vector[j+1] = vector[j]            }            //插入位置前後都是有序的,最後也是有序的            vector[j+1] = temp        }        fmt.Println(vector)    }}func main() {    primes := [6]int{3, 11, 5, 2, 13, 7}    fmt.Println("orginal", primes)    InsertSort(primes[:])    fmt.Println("after sorting", primes)}/**    out:        orginal [3 11 5 2 13 7]        InsertSort        [3 11 5 2 13 7]        [3 11 5 2 13 7]        [3 5 11 2 13 7]        [2 3 5 11 13 7]        [2 3 5 11 13 7]        [2 3 5 7 11 13]        after sorting [2 3 5 7 11 13]**/

4. 選擇排序

package mainimport "fmt"func SelectSort(vector []int) {    fmt.Println("SelectSort")    fmt.Println(vector)    for i := 0; i < len(vector); i++ {        // 選擇最小的元素        k := i        for j := i + 1; j < len(vector); j++ {            if vector[k] > vector[j] {                k = j            }        }        // 交換        if k != i {            temp := vector[i]            vector[i] = vector[k]            vector[k] = temp        }        fmt.Println(vector)    }}func main() {    primes := [6]int{3, 11, 5, 2, 13, 7}    fmt.Println("orginal", primes)    SelectSort(primes[:])    fmt.Println("after sorting", primes)}/**    out:        orginal [3 11 5 2 13 7]        SelectSort        [3 11 5 2 13 7]        [2 11 5 3 13 7]        [2 3 5 11 13 7]        [2 3 5 11 13 7]        [2 3 5 7 13 11]        [2 3 5 7 11 13]        [2 3 5 7 11 13]        after sorting [2 3 5 7 11 13]**/

5. 二元選擇排序

package mainimport "fmt"func BinarySelectSort(vector []int) {    fmt.Println("SelectSort")    fmt.Println(vector)    n := len(vector)    for i := 0; i < n/2; i++ {        // 選擇最小的元素和最大元素        k := i        t := n - i - 1        for j := i + 1; j <= n-i-1; j++ {            if vector[k] > vector[j] {                k = j            }            if vector[t] < vector[j] {                t = j            }        }        // 交換        if k != i {            temp := vector[i]            vector[i] = vector[k]            vector[k] = temp        }        if t != n-i-1 {            temp := vector[n-i-1]            vector[n-i-1] = vector[t]            vector[t] = temp        }        fmt.Println(vector)    }}func main() {    primes := [6]int{3, 11, 5, 2, 13, 7}    fmt.Println("orginal", primes)    BinarySelectSort(primes[:])    fmt.Println("after sorting", primes)}/**    out:        orginal [3 11 5 2 13 7]        SelectSort        [3 11 5 2 13 7]        [2 11 5 3 7 13]        [2 3 5 11 7 13]        [2 3 5 11 7 13]        after sorting [2 3 5 11 7 13]**/

6. 快速排序

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