一遍Hash即可完成任务

import java.util.*;

public class Solution {
    public 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.get(target - numbers[i]) != null) {
                result[0] = map.get(target - numbers[i]) + 1;
                result[1] = i + 1;
                return result;
            }
            map.put(numbers[i], i);
        }
        return result;
    }
}