int n; cin >> n; for (int x=1;x<=n;x++){ for (int a1=n-x;a1>=1;a1--){ cout << " "; } for (int a2=1;a2<=x;a2++){ cout << a2; } for (int a3=x-1;a3>=1;a3--){ cout << a3; } cout << endl; } return 0;