Two Sum (easy)

public class Test {

    public static void main(String[] args) {
        System.out.println(Arrays.toString(twoSum(new int[]{2,7,11,15}, 9)));
        System.out.println(Arrays.toString(twoSum(new int[]{3,2,4}, 6)));
        System.out.println(Arrays.toString(twoSum(new int[]{3,3}, 6)));
        System.out.println(Arrays.toString(twoSum(new int[]{-3,4,3,90}, 0)));
    }

    public static int[] twoSum(int[] nums, int target) {
        //
    }
}

public static int[] twoSum(int[] nums, int target){
    Map<Integer, Integer> bucket=new HashMap<>();
    
    for(int i=0;i<nums.length;i++){
        int num=nums[i];
    
    
        if(bucket.containsKey(num)){
            return new int[]{bucket.get(num),i};
        }
        bucket.put(target-num,i);
    }
    
    return null;
}