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class Solution {
public:
    vector<vector<int>> generate(int numRows) {
        vector<vector<int>> res;
        res.resize(numRows);
        for(int i = 0; i < numRows; i++) {
            res[i].resize(i+1);
            res[i][0] = 1;
            res[i][res[i].size() - 1] = 1;
            for(int j = 1; j < res[i].size() - 1; j++) {
                res[i][j] = res[i - 1][j - 1] + res[i - 1][j];
            }
        }
        return res;
    }
};