Maximize Distance to Closest Person — Python

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


class Solution(object):
    def maxDistToClosest(self, seats):
        """
        :type seats: List[int]
        :rtype: int
        """
        prev, result = -1, 1
        for i in xrange(len(seats)):
            if seats[i]:
                if prev < 0:
                    result = i
                else:
                    result = max(result, (i-prev)//2)
                prev = i
        return max(result, len(seats)-1-prev)