LeetCode OJ 系列之118 Pascal's Triangle --Python
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Problem:
Given numRows, generate the first numRows of Pascal's triangle.
For example, given numRows = 5,
Return
[ [1], [1,1], [1,2,1], [1,3,3,1], [1,4,6,4,1]]Answer:
class Solution(object): def generate(self, numRows): """ :type numRows: int :rtype: List[List[int]] """ result = [[1 for j in range(i+1)] for i in range(numRows)] for i in range(len(result)): for j in range(len(result[i])): if j == 0 or j == len(result[i])-1: continue else: result[i][j] = result[i-1][j-1] + result[i-1][j] return result
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