Method helper

python/0213-house-robber-ii.py:5–12

(self, nums)

        return max(nums[0], self.helper(nums[1:]), self.helper(nums[:-1]))

    def helper(self, nums):
        rob1, rob2 = 0, 0

        for n in nums:
            newRob = max(rob1 + n, rob2)
            rob1 = rob2
            rob2 = newRob
        return rob2