Cookies problem

Cookies.swift

func cookies(k: Int, A: [Int]) -> Int {
    var sorted = A.sorted()

    var iterations = 0

    while sorted.count >= 2 && sorted[0] < k {
        let leastSweet = sorted.removeFirst()
        let secondLeastSweet = sorted.removeFirst()

        let combined = leastSweet + 2 * secondLeastSweet
        insertAndSort(combined, &sorted)

        iterations += 1
    }

    return (sorted.isEmpty || sorted[0] < k) ? -1 : iterations
}

func insertAndSort(_ value: Int, _ array: inout [Int]) {
    array.insert(value, at: 0)
    array.sort()
}