public static int[] twoSum(int[] nums, int target) {
    HashMap<Integer, Integer> map = new HashMap<>();
    int sum = 0;
    int[] result = new int[2];
    for (int i = 0; i < nums.length; i++) {
        sum = target - nums[i];
        Integer i1 = map.get(sum);
        if (i1 != null){
            result[0] = i;
            result[1] = i1;
            break;
        }
        else {
            map.put(nums[i],i);
        }
    }
    return result;
}