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QuickSort.go
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QuickSort.go
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package main
import (
"fmt"
"math/rand"
"time"
)
func main() {
slice := generateSlice(20)
fmt.Println("\n--- Unsorted --- \n\n", slice)
quicksort(slice)
fmt.Println("\n--- Sorted ---\n\n", slice, "\n")
}
// Generates a slice of size, size filled with random numbers
func generateSlice(size int) []int {
slice := make([]int, size, size)
rand.Seed(time.Now().UnixNano())
for i := 0; i < size; i++ {
slice[i] = rand.Intn(999) - rand.Intn(999)
}
return slice
}
func quicksort(a []int) []int {
if len(a) < 2 {
return a
}
left, right := 0, len(a)-1
pivot := rand.Int() % len(a)
a[pivot], a[right] = a[right], a[pivot]
for i, _ := range a {
if a[i] < a[right] {
a[left], a[i] = a[i], a[left]
left++
}
}
a[left], a[right] = a[right], a[left]
quicksort(a[:left])
quicksort(a[left+1:])
return a
}