import java.util.HashMap;

import java.util.Map;

/**

* Created by codingBoy on 17/2/3.

*/

public class two_sum {

public static void main(String[] args)

{

int[] numbers=new int[]{2,7,11,15};

int target=9;

int[] result =new int[2];

result=twoSum(numbers,target);

System.out.println(result[0]+","+result[1]);

}

public static int[] twoSum(int[] numbers, int target) {

int[] result = new int[2];

Map<Integer, Integer> map = new HashMap<>();

for (int i = 0; i < numbers.length; i++) {

if (map.containsKey(target - numbers[i])) {

result[1] = i + 1;

result[0] = map.get(target - numbers[i]);

return result;

}

map.put(numbers[i], i + 1);

}

return result;

}

}