Pascal's 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]
]

Code:

 vector<vector<int>> generate(int numRows) {
        vector<vector<int>>result;
        vector<int>temp;
        
        if (numRows >= 1)
        {
            temp.push_back(1);
            result.push_back(temp);
            temp.clear();
            
            for (int i = 1; i < numRows; ++i)
            {
                for (int j = 0; j <= i; ++j)
                {
                    if (j == 0)
                        temp.push_back(result[i-1][0]);
                    else if (j==result[i-1].size())
                        temp.push_back(result[i-1][j-1]);
                    else
                        temp.push_back(result[i-1][j]+result[i-1][j-1]);
                }
                result.push_back(temp);
                temp.clear();
            }
        }
        return result;
    }