Man i have better version of solution. See my code.

vector array_left_rotation(vector a, int n, int k) { rotate(a.begin(),a.begin()+k,a.end()); return a; }

int main(){ int n; int k; cin >> n >> k; vector a(n); for(int a_i = 0;a_i < n;a_i++){ cin >> a[a_i]; } vector output = array_left_rotation(a, n, k); for(int i = 0; i < n;i++) cout << output[i] << " "; cout << endl; return 0; }