Best way to remove selected elements from slice

I have one slice A and another slice B. Slice A contains n elements, slice B is a subset of slice A, where each element is a pointer to slice A.

What is the cheapest way to remove all elements in A from B?

A and B may have duplicates and may not be sorted.

For example, the growth rate O(n),

package main

import "fmt"

func remove(a []int, b []*int) []int {
    d := make(map[*int]bool, len(b))
    for _, e := range b {
        d[e] = true
    }
    var c []int
    if len(a) >= len(d) {
        c = make([]int, 0, len(a)-len(d))
    }
    for i := range a {
        if !d[&a[i]] {
            c = append(c, a[i])
        }
    }
    return c
}

func main() {
    a := []int{0, 1, 2, 3, 4, 5, 6, 7}
    fmt.Println(a)
    b := []*int{&a[1], &a[3], &a[3], &a[7], &a[4]}
    a = remove(a, b)
    fmt.Println(a)
}

Playground : https://play.golang.org/p/-RpkH51FSt2 _

output:

[0 1 2 3 4 5 6 7]
[0 2 5 6]