# QuickSort algorithm
function quicksort(array)
    less, equal, greater := three empty arrays
    if length(array) > 1  
        pivot := select any element of array
        for each x in array
            if x < pivot then add x to less
            if x = pivot then add x to equal
            if x > pivot then add x to greater
        quicksort(less)
        quicksort(greater)
        array := concatenate(less, equal, greater)

result := quicksort([3, 2, 1])
printf("The sorted array: %s", result)