```
class Solution:
# @param {integer[]} numss
# @param {integer} target
# @return {integer}
def search(self, nums, target):
if not nums:
return -1
low, high = 0, len(nums) - 1
while low <= high:
mid = (low + high) / 2
if target == nums[mid]:
return mid
if nums[low] <= nums[mid]:
if nums[low] <= target <= nums[mid]:
high = mid - 1
else:
low = mid + 1
else:
if nums[mid] <= target <= nums[high]:
low = mid + 1
else:
high = mid - 1
return -1
```