题解 | 两数之和

import java.util.*;


public class Solution {
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     *
     * @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) {
        Map<Integer, Integer> map = new HashMap<>();
        map.put(numbers[0], 1);
        for (int i = 1; i < numbers.length; i++) {
            int deff = target - numbers[i];
            Integer b = map.get(deff);
            if (b != null) {
                return new int[] {b, i + 1};
            } else {
                map.put(numbers[i], i + 1);
            }
        }
        return null;
    }
}