class Solution {
public:
    int search(vector<int>& nums, int target) {
        if(nums.empty())return -1;
        int l=0;
        int r=nums.size()-1;
        while(l<r)
        {
            int mid=l+r+1>>1;
            if(nums[mid]>=nums[0])l=mid;
            else r=mid-1;
        }
        if(target>=nums[0])l=0;
        else l=r+1,r=nums.size()-1;
        while(l<r)
        {
            int mid=l+r>>1;
            if(nums[mid]>=target)r=mid;
            else l=mid+1;
        }
        if(nums[r]==target)return r;
        return -1;
    }
};