两数之和

使用Hashmap即可

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

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

        for (int i=0;i<numbers.length;i++){
            if(map.containsKey(target-numbers[i])){
                return new int[]{map.get(target-numbers[i])+1,i+1};
            }else {
                map.put(numbers[i],i);
            }
        }
        return new int[2];
    }