import java.util.*;
 
public class Main {
    public int[] twoSum(int[] nums, int target) {
        Map<Integer, Integer> map = new HashMap<>();
        for (int i = 0; i < nums.length; i++) {
            int num = nums[i];
            int num1 = target - num;
            if (map.containsKey(num1)) {
                return new int[]{map.get(num1), i};
            } else {
                map.put(num, i);
            }
        }
        return null;
    }
 
    public static void main(String[] args) {
        Main obj = new Main();
        int[] nums = {2, 7, 11, 15};
        int target = 9;
 
        int[] result = obj.twoSum(nums, target);
        if (result != null) {
            System.out.println("Indices: " + result[0] + ", " + result[1]);
        } else {
            System.out.println("No two sum solution found.");
        }
    }
}
 

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