func BenchmarkSparseBitVector(b *testing.B) {
prng := rand.New(rand.NewSource(0))
for tries := 0; tries < b.N; tries++ {
var x, y, z intsets.Sparse
for i := 0; i < 1000; i++ {
n := int(prng.Int()) % 10000
if i%2 == 0 {
x.Insert(n)
} else {
y.Insert(n)
}
}
z.Union(&x, &y)
z.Difference(&x, &y)
}
}