Solution.cpp

class Solution {
public:
    vector<vector<int>> generate(int numRows) {
        vector<vector<int>> ans;
        for (int i = 0; i < numRows; ++i) {
            vector<int> t(i + 1, 1);
            for (int j = 1; j < i; ++j) t[j] = ans[i - 1][j] + ans[i - 1][j - 1];
            ans.push_back(t);
        }
        return ans;
    }
};