Given an integer array sorted in ascending order, write a function to search target in nums. If target exists, then return its index, otherwise return -1. However, the array size is unknown to you. You may only access the array using an ArrayReader interface, where ArrayReader.get(k) returns the element of the array at index k (0-indexed). You may assume all integers in the array are less than 10000, and if you access the array out of bounds, ArrayReader.get will return 2147483647. Example 1: Input: array = [-1,0,3,5,9,12], target = 9 Output: 4 Explanation: 9 exists in nums and its index is 4 Example 2: Input: array = [-1,0,3,5,9,12], target = 2 Output: -1 Explanation: 2 does not exist in nums so return -1 Constraints: You may assume that all elements in the array are unique. The value of each element in the array will be in the range [-9999, 9999]. The length of the array will be in the range [1, 10^4].