Pascal's Triangle (Leetcode 118)

Problem Link: https://leetcode.com/problems/pascals-triangle/

class Solution:
    def generate(self, numRows: int) -> List[List[int]]:

        res=[[1]]

        for i in range(numRows-1):

            temp=[0]+res[-1]+[0]
            row=[]
            for j in range(1,len(temp)):
                row.append(temp[j]+temp[j-1])
            res.append(row)
        
        return res