Construct the Rectangle

就是一个O(√n)的算法，需要注意提前返回结果就好

class Solution(object):
    def constructRectangle(self, area):
        """
        :type area: int
        :rtype: List[int]
        """
        for i in xrange(int(area ** 0.5), 0, -1):
            if area % i == 0:
                return sorted([i, area / i], reverse=True)
        return []