119. Pascal's Triangle II

Given an index k, return the kth row of the Pascal's triangle.

For example, given k = 3,
Return [1,3,3,1].

 自己写的~~

class Solution(object):
    def getRow(self, rowIndex):
        """
        :type rowIndex: int
        :rtype: List[int]
        """
        
        res=[[1]]
        for i in range(1,rowIndex+1):
            res += [map(lambda x,y: x+y, res[-1]+[0], [0]+res[-1])]
        return res[rowIndex]

for i in range(1,2): i 只能取到1