class Solution:
    # @param {integer} numRows
    # @return {integer[][]}
    def generate(self, numRows):
        if numRows == 0:
            return []
        if numRows == 1:
            return [[1]]
        rtn = [[1],[1,1]]
        for i in range(2,numRows):
            temp = [1]
            for j in range(1, i):
                temp.append(rtn[i-1][j-1]+rtn[i-1][j])
            temp.append(1)
            rtn.append(temp)
        return rtn

归并边界 Most Voted Solution

class Solution:
# @return a list of lists of integers
def generate(self, numRows):
    lists = []
    for i in range(numRows):
        lists.append([1]*(i+1))
        if i>1 :
            for j in range(1,i):
                lists[i][j]=lists[i-1][j-1]+lists[i-1][j]
    return lists