C++ :

#include <iostream> 
using namespace std; 
int main() { 
    int N; 
    cin >> N; 
    int num = 1;
    for (int i = 0; i < N; ++i) { 
        for (int j = 0; j < N; ++j) { 
            if (j > 0) { 
                cout << " ";
            }
            cout << num; 
            num++; 
        } 
        cout << endl;
    } 
    return 0; 
}