public int[] twoSum(int[] nums, int target){
HashMap<Integer,Integer> map = new HashMap<Integer,Integer>();
int[] res = new int[2];

for(int i=0; i<nums.length;i++){
if(map.containsKey(nums[i])){
res[0] = map.get(nums[i]);
res[1] = i;
}
map.put(target-nums[i],i);
}return res;

}