两数之和

import java.util.*;


public class Solution {
    /**
     * 
     * @param numbers int整型一维数组 
     * @param target int整型 
     * @return int整型一维数组
     */
    public int[] twoSum (int[] numbers, int target) {
        // write code here
        Map<Integer, Integer> mem = new HashMap<>();

        for (int i = 0; i < numbers.length; i++) {
            int another = target - numbers[i];
            if (mem.containsKey(another) && mem.get(another) != i) {
                return new int[]{mem.get(another) + 1, i + 1};
            } else mem.put(numbers[i], i);
        }
        return new int[]{};
    }
}