Given numRows, generate the first numRows of Pascal's triangle.
For example, given numRows = 5,
Return
class Solution {
public:
vector<vector<int>> generate(int numRows) {
vector<vector<int>>result(numRows);
for (int i = 0; i<numRows; i++) {
result[i].resize(i+1);
result[i][0] = result[i][i] = 1;
for (int j = 1; j<i; j++) {
result[i][j] = result[i-1][j-1]+result[i-1][j];
}
}
return result;
}
};
