118. Pascal's Triangle.cpp

class Solution {
public:
    vector<vector<int>> generate(int numRows) {
        vector < vector < int > > ans;
        for( int row = 0 ; row < numRows ; row++ ) { 
            vector < int > now;
            for( int col = 0 ; col <= row ; col++ ) { 
                    
                    if( col == 0 || col == row ) now.push_back(1);
                    else now.push_back( ans[row-1][col-1]  + ans[row-1][col]);

            }
            
            ans.push_back(now);
        }
        return ans;
    }
};