golang实现归并排序"/>
golang实现归并排序
使用版本: go version go1.12.1
/*
内存中的归并排序
*/
package mainimport "fmt"
import "math/rand"func mergesort(a []int, l int, r int) {
if l >= r {
return
} else {
mid := (l + r) / 2
// fmt.Println("call mergesort between", l, " and ", mid)
mergesort(a, l, mid)
// fmt.Println("call mergesort between", mid+1, " and ", r)
mergesort(a, mid+1, r)
merge(a, l, mid, r)
}
}func merge(a []int, l int, mid int, r int) {
temp := make([]int, 100, 120)
copy(temp, a)
t := l
i, j := l, mid+1
for {
if i>mid || j >r {
break
}
if a[i] < a[j] {
temp[t] = a[i]
t += 1
i += 1
} else {
temp[t] = a[j]
t += 1
j += 1
}
}for {
if i > mid {
break
}
temp[t] = a[i]
t += 1
i += 1
}for {
if j > r {
break
}
temp[t] = a[j]
t += 1
j += 1
}// fmt.Println("merge result:", temp)
for i := l; i < r; i++ {
a[i] = temp[i]
}}
func main() {
var n int
n = 100
a := make([]int, 100, 120)
for i := 0; i < 100; i++ {
a[i] = rand.Intn(100)
}
fmt.Println("start merge sort")
mergesort(a, 0, n-1)
fmt.Println("Final result:", a)
}
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golang实现归并排序
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