package main                                                                                                                                                                                                                                
import (                                                                                                                  
    "fmt"                                                                                                                 
    "math/rand"                                                                                                       
)                                                                                                                                                                                                                                           

func swap(num []int, num1 int, num2 int) {                                                                                
    temp := num[num1]                                                                                                     
    num[num1] = num[num2]                                                                                                 
    num[num2] = temp                                                                                                  
}                                                                                                                                                                                                                                           

func partition(num []int, left int, right int) (int, int){                                                                
    less := left - 1                                                                                                      
    more := right                                                                                                         
    for (left < more) {                                                                                                       
        if(num[left] < num[right]){                                                                                                 
            less++                                                                                                                
            swap(num, less, left)                                                                                                 
            left++                                                                                                            
        } else if (num[left] > num[right]){                                                                                       
            more--                                                                                                                  
            swap(num, more, left)                                                                                             
        } else {                                                                                                                  
            left++                                                                                                            
        }                                                                                                                 
    }                                                                                                                     
    swap(num, more, right)                                                                                                
    return less + 1, more                                                                                             
}    

func RandomQuickSorting(num []int, left int, right int) {                                                                 
    if(num == nil || len(num) < 2) {                                                                                          
        return                                                                                                            
    }                                                                                                                                                                                                                                           
    if(left < right) {                                                                                                        
        swap(num, right, left + rand.Intn(right - left + 1))                                                                  
        start, end := partition(num, left, right)                                                                               
        fmt.Println("Select Number: ", num[start])                                                                            
        RandomQuickSorting(num, left, start - 1)                                                                              
        RandomQuickSorting(num, end + 1, right)                                                                           
    }                                                                                                                                                                                                                                       
}                                                                                                                                                                                                                                           
func main() {                                                                                                             
    num := [...]int{7,5,9,3,4,9,2,1,6,8,4,9,3}                                                                            
    fmt.Println("Brfore Sort: ", num)                                                                                     
    RandomQuickSorting(num[:], 0, len(num) - 1)                                                                           
    fmt.Println("After Sort: ", num)                                                                                  
}