Zadatak 13.

#include <bits/stdc++.h>

using namespace std;

int main()
{
   int N;
   cin >> N;
   int niz[N];
    for (int i = 1; i <= N; i++){
            for (int j = 1; j <= i; j++){
                cout << j << " ";
            }
            cout << endl;
    }

   return 0;
}