java-two-sum.java

class Solution {
    public int[] twoSum(int[] nums, int target) {
        HashMap<Integer,Integer> map=new HashMap<>();
        for(int i=0;i<nums.length;i++){
            if(map.containsKey(target-nums[i])){
                return new int[]{i,map.get(target-nums[i])};
            }
            else{
                map.put(nums[i],i);
            }
        }
        return new int[]{};
    }
}