双指针即可,太简单了。
class Solution {
public int[] twoSum(int[] numbers, int target) {
int i=0;
int j = numbers.length-1;
while(i<j){
if(numbers[i]+numbers[j]==target) return new int[]{
i,j};
if(numbers[i]+numbers[j]>target) j--;
if(numbers[i]+numbers[j]<target) i++;
}
return null;
}
}