ques 12

#include <iostream>

using namespace std;

int main() {
    int n;

   
    cout << "Enter the number of rows: ";
    cin >> n;

    int a = 0, b = 1, c;

    for (int i = 0; i < n; ++i) {
        c = a;
        for (int j = 0; j <= i; ++j) {
            cout << c << "\t";
            c = a + b;
            a = b;
            b = c;
        }
        cout << endl;
    }

    return 0;
}