Eliminate Maximum Number of Monsters — Python

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

class Solution(object):
    def eliminateMaximum(self, dist, speed):
        """
        :type dist: List[int]
        :type speed: List[int]
        :rtype: int
        """
        for i in xrange(len(dist)):
            dist[i] = (dist[i]-1)//speed[i]
        dist.sort()
        result = 0
        for i in xrange(len(dist)):
            if result > dist[i]:
                break
            result += 1
        return result