public int[] twoSum2(int[] numbers, int target) {

    for (int i = 0 ; i < numbers.length ; i++) {
      for (int j = i + 1 ; j < numbers.length ; j++) {
        if (numbers[i] + numbers[j] == target) {
          return new int[] { i + 1, j + 1 };
        }
      }
    }

    return null;
  }