Best Sightseeing Pair — Python

# Time:  O(n)
# Space: O(1)

class Solution(object):
    def maxScoreSightseeingPair(self, A):
        """
        :type A: List[int]
        :rtype: int
        """
        result, curr = 0, 0
        for x in A:
            result = max(result, curr+x)
            curr = max(curr, x)-1
        return result