pattern9.cpp

#include <iostream>
using namespace std;

/*
Here n = 5
1         
0 1       
1 0 1     
0 1 0 1   
1 0 1 0 1 
*/

int main() {
    int n;
    cin >> n;
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= i; j++) {
            if ((i+j) % 2 == 0 ){
                cout << 1 << " ";
            } else {
                cout << 0 << " ";
            }
        }
        cout << endl;
    }
}