Pascal's Triangle

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]]

#include<iostream>#include<vector>#include<algorithm>using namespace std;vector<vector<int> > generate(int numRows) {vector<vector<int>> Result;if (numRows == 0)return Result;vector<int> firstrow(1, 1);Result.push_back(firstrow);for (int i = 1; i != numRows;++i){vector<int> Irows(i + 1, 1);for (int j = 1; j != i;++j)Irows[j] = Result.back()[j - 1] + Result.back()[j];Result.push_back(Irows);}return Result;}