Permuting Two Arrays

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    Java:

    public static String twoArrays(int k, List<Integer> A, List<Integer> B) {
        A.sort(Comparator.naturalOrder());
        B.sort(Comparator.reverseOrder());
        for (int i=0; i < A.size(); ++i) {
            if (k > A.get(i) + B.get(i)) {
                return "NO";
            }
        }
        return "YES";
    }