package array;
import  java.util.*;
public class towSum {
    public static void main(String[] args) {

    }

    public int[] twosum(int[] nums, int target) {
        Map<Integer, Integer> map = new HashMap<>();
        for (int i = 0; i < nums.length; i++) {
            map.put(nums[i], i);

        }
        for (int i = 0; i < nums.length; i++) {
            int complement = target - nums[i];
            if (map.containsKey(complement) && map.get(complement) != i) {
                return new int[]{i, map.get(complement)};
            }
        }
        throw new IllegalArgumentException("NO two sum solution");

    }
}