题目：

题解：

class Solution {public int[] twoSum(int[] numbers, int target) {int low = 0, high = numbers.length - 1;while (low < high) {int sum = numbers[low] + numbers[high];if (sum == target) {return new int[]{low + 1, high + 1};} else if (sum < target) {++low;} else {--high;}}return new int[]{-1, -1};}
}