Pascal_Triangle_I.cpp

class Solution {
public:
    vector<vector<int> > generate(int numRows) {
        // Start typing your C/C++ solution below
        // DO NOT write int main() function
        vector<vector<int> > ans;
        
        for(int i=0;i<numRows;i++)
        {
            vector<int> row;
            for(int j=0;j<=i;j++)
            {
                if(j==0 || j==i)
                {
                    row.push_back(1);
                }
                else
                {
                    row.push_back(ans[i-1][j-1]+ans[i-1][j]);
                }                
            }
            ans.push_back(row);
        }
        
        return ans;
    }
};'