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package main
import (
"fmt"
"math/rand"
"time"
)
func kuai(arr []int, l, r int) {
if l >= r {
return
}
i := l
j := r
base := arr[j]
for i < j {
for ; arr[j] >= base && i < j; j-- {
}
for ; arr[i] <= base && i < j; i++ {
}
arr[i], arr[j] = arr[j], arr[i]
}
// 将基准与边界交换
arr[r], arr[i+1] = arr[i+1], arr[r]
kuai(arr, l, i)
kuai(arr, i+1, r)
}
func timeCost() func() {
start := time.Now()
return func() {
// 纳秒
println("time cost ", time.Since(start))
}
}
func testKuai(arr []int) []int {
defer timeCost()()
kuai(arr, 0, len(arr)-1)
return arr
}
func main() {
source := rand.Perm(1000)
fmt.Println(source)
fmt.Println(testKuai(source))
return
}
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