leetcode: 119. Pascal's Triangle II

阿新 • • 發佈：2018-11-08

Difficulty

Easy.

Problem

Given a non-negative index k where k ≤ 33, return the kth index row of the Pascal's triangle.

Note that the row index starts from 0.

在這裡插入圖片描述

In Pascal's triangle, each number is the sum of the two numbers directly above it.

Example:

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


Could you optimize your algorithm to use only O(k) extra space?

AC

class Solution():
    def getRow(self, n):
        if n == 0:
            return [1]
        else:
            level = self.getRow(n-1)
            return list(map(lambda x, y: x+y, [0]+level, level+[0]))

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leetcode: 119. Pascal's Triangle II

Difficulty

Problem

AC

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