[LeetCode]题解（python）：119 Pascal's Triangle II

题目来源

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https://leetcode.com/problems/pascals-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].

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题意分析

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Input:integer

Output:kth row of the Pascal's triangle

Conditions:只返回第n行

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题目思路

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同118，不同之处在于只返回某一层，同时注意与上题的下标起点不一样（rowIndex先加个1 = =）

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AC代码（Python）

 class Solution(object):
     def getRow(self, rowIndex):
         """
         :type rowIndex: int
         :rtype: List[int]
         """
         rowIndex += 1
         ans = []
         if rowIndex == 0:
             return []
         for i in range(rowIndex):
             this = []
             for j in range(i+1):
                 this.append(1)
             if i > 1:
                 for x in range(i - 1):
                     this[x+1] = ans[i-1][x] + ans[i-1][x+1]
             print this
             ans.append(this)

         return ans[rowIndex - 1]