702

/**
 * // This is the ArrayReader's API interface.
 * // You should not implement it, or speculate about its implementation
 * class ArrayReader {
 *   public:
 *     int get(int index);
 * };
 */

class Solution {
public:
    int search(const ArrayReader& reader, int target) {
        int left = 0, right = 10000;

        while(left<=right){
            int mid = (left+right)/2;
            int val = reader.get(mid);
            if(val == target)
                return mid;
            else if(val > target)
                right = mid-1;
            else
                left = mid+1;
        }
        return -1;
    }
};