119. Pascal's Triangle II@python

阿新 • • 發佈：2018-10-05

dex nbsp style pascal ron output als NPU 時間復雜度

Given a non-negative index k where k ≤ 33, return the k^thindex row of the Pascal‘s triangle.

Note that the row index starts from 0.

Example:

Input: 3
Output: [1,3,3,1]

原題地址: Pascal‘s Triangle II

題意: 楊輝三角

代碼:

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

時間復雜度:O(n^2)

空間復雜度: O(n)

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