力扣题目链接
跟两数之和好像啊
于是写了一个HashMap

class Solution {
    public int[] twoSum(int[] numbers, int target) {
        int[] a = new int[2];
        Map<Integer,Integer> map = new HashMap<>();
        for(int i=0;i<numbers.length;i++){
            if(map.get(target-numbers[i])!=null){
                a[0] = map.get(target-numbers[i]);
                a[1] = i;
            }
            map.put(numbers[i],i);
        }
        return a;
    }
}

看到运行结果哭了

原来大佬们都是用的双指针直接0ms

class Solution {
    public int[] twoSum(int[] numbers, int target) {
        int i = 0,j = numbers.length-1;
        int[] res = new int[2];
        while(i<j){
            if(numbers[i] + numbers[j] > target){
                j--;
            }
            else if(numbers[i] + numbers[j] < target){
                i++;
            }
            else{
                res = new int[]{i,j};
                break;
            }   
        }
        return res;
    }
}