class Solution(object):
def generate(self, numRows):
"""
:type numRows: int
:rtype: List[List[int]]
"""
res = []
if numRows == 0:
return res
res.append([1])
for i in range(1,numRows):
# curLength = i + 1
curRow = [1]*(i+1)
for j in range(1,i):
curRow[j] = res[i-1][j-1] + res[i-1][j]
res.append(curRow)
return res
https://leetcode.com/problems/pascals-triangle/#/description
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]
]