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class Solution {
public:
    vector<vector<int>> generate(int numRows) {
        vector<vector<int>> ans;
        ans.push_back(vector<int>(1,1));

        for(int i=1; i<numRows; i++){
            vector<int> row;
            row.push_back(1);
            for(int j=1; j<i; j++){
                row.push_back(ans[i-1][j-1]+ans[i-1][j]);
            }
            row.push_back(1);
            ans.push_back(row);
        }
        return ans;
    }
};