giúp mik vs làm C++ nha ( càng nhanh càng tốt ạ )

#include <bits/stdc++.h>
#define _kiet int main ()
#define ll long long
#define str string
#define fir first
#define sec second
#define ld long double
#define pb push_back
#define MOD 100000009
#define freopen(name) if(fopen(name".INP","r")) {freopen (name".INP","r",stdin); freopen (name".OUT","w",stdout);}
#define ALL(x) (x).begin(),(x).end()
using namespace std;
_kiet
{
    int n;
    cin >> n;
    vector<int> a(n);
    for (int i = 0; i < n; i++) a[i] = i + 1;
    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j <= i; j++) cout << a[(j + i) % n] << " ";
        cout << endl;
    }
    return 0;
}
// đúng test nhma kbt full k