旋转数组的最小元素

class Solution {
public:
    int minNumberInRotateArray(vector<int> rotateArray) {
        /*
        if(rotateArray.size() == 0)
        {
            throw new std::exception("Invalid parameters");
        }
        */
        int start = 0,end = rotateArray.size()-1;
        int indexMid = start;
        while(rotateArray[start]>=rotateArray[end])
        {
            if(end-start == 1)
            {
                indexMid = end;
                break;
            }
            indexMid=(start+end)/2;
            if(rotateArray[indexMid]>=rotateArray[start])
                start = indexMid;
            else if(rotateArray[indexMid] <= rotateArray[end])
                end = indexMid;
        }
        return rotateArray[indexMid];
    }
};