class  {
    public int[] twoSum(int[] nums, int target) {
        Map<Integer, Integer> map = new HashMap<>();
        int[] res = {-1, -1};
        if (nums == null || nums.length < 2) {
            return res;
        }
        for (int i = 0; i < nums.length; i++) {
            int a = nums[i];
            int b = target - nums[i];
            if (map.containsKey(b)) {
                
                int j = map.get(b);
                res = new int[]{i, j};
                break;
            }
            map.put(a, i);
        }
        return res;
    }
}