#include <vector>
#include <iostream>

using namespace std;

vector<vector<int> > generate(int numRows) {
    if (numRows <= 0) {
        return vector<vector<int> >();
    }
    
    vector<vector<int> > result(numRows, vector<int>());
    
    result[0].push_back(1);
    for (int i = 1; i < numRows; ++i) {
        result[i].resize(i+1, 1);
        for (int j = 1; j < i; ++j) {
            result[i][j] = result[i-1][j-1] + result[i-1][j];
        }
    }
    
    return result;
}

void printVV(vector<vector<int> > vv) {
    size_t si = vv.size();
    for (int i = 0; i < si; ++i) {
        vector<int> &v = vv[i];
        size_t sj = v.size();
        for (int j = 0; j < sj; ++j) {
            cout << v[j] << ", ";
        }
        
        cout << endl;
    }
}

int main (int argc, const char * argv[]) {
    
    cout << "Pascal's Triangle of 7:" << endl;
    printVV(generate(7));
    
    cout << endl << "Pascal's Triangle of 21:" << endl;
    printVV(generate(21));
    return 0;
}


//Output:
//    Pascal's Triangle of 7:
//    1, 
//    1, 1, 
//    1, 2, 1, 
//    1, 3, 3, 1, 
//    1, 4, 6, 4, 1, 
//    1, 5, 10, 10, 5, 1, 
//    1, 6, 15, 20, 15, 6, 1, 
//
//    Pascal's Triangle of 21:
//    1, 
//    1, 1, 
//    1, 2, 1, 
//    1, 3, 3, 1, 
//    1, 4, 6, 4, 1, 
//    1, 5, 10, 10, 5, 1, 
//    1, 6, 15, 20, 15, 6, 1, 
//    1, 7, 21, 35, 35, 21, 7, 1, 
//    1, 8, 28, 56, 70, 56, 28, 8, 1, 
//    1, 9, 36, 84, 126, 126, 84, 36, 9, 1, 
//    1, 10, 45, 120, 210, 252, 210, 120, 45, 10, 1, 
//    1, 11, 55, 165, 330, 462, 462, 330, 165, 55, 11, 1, 
//    1, 12, 66, 220, 495, 792, 924, 792, 495, 220, 66, 12, 1, 
//    1, 13, 78, 286, 715, 1287, 1716, 1716, 1287, 715, 286, 78, 13, 1, 
//    1, 14, 91, 364, 1001, 2002, 3003, 3432, 3003, 2002, 1001, 364, 91, 14, 1, 
//    1, 15, 105, 455, 1365, 3003, 5005, 6435, 6435, 5005, 3003, 1365, 455, 105, 15, 1, 
//    1, 16, 120, 560, 1820, 4368, 8008, 11440, 12870, 11440, 8008, 4368, 1820, 560, 120, 16, 1, 
//    1, 17, 136, 680, 2380, 6188, 12376, 19448, 24310, 24310, 19448, 12376, 6188, 2380, 680, 136, 17, 1, 
//    1, 18, 153, 816, 3060, 8568, 18564, 31824, 43758, 48620, 43758, 31824, 18564, 8568, 3060, 816, 153, 18, 1, 
//    1, 19, 171, 969, 3876, 11628, 27132, 50388, 75582, 92378, 92378, 75582, 50388, 27132, 11628, 3876, 969, 171, 19, 1, 
//    1, 20, 190, 1140, 4845, 15504, 38760, 77520, 125970, 167960, 184756, 167960, 125970, 77520, 38760, 15504, 4845, 1140, 190, 20, 1,