programa que desde un vector de numeros, se quiere recorrer 3 posiciones 1 puede ser negativo o positivo 8 7 2 1 7 2 1 8

#include <iostream> //std::cout std::cin
#include <vector> //std::vector

int main() {
  std::vector<int> vector1;
  int num;
  std::cin >> num;
  while (num != -1) {
    vector1.push_back(num);
    std::cin >> num;
  }
  int n;
  std::cin >> n;
  n = n % vector1.size();
  int i;
  // method 1:
  std::vector<int> vector2;
  for (i = 0; i < vector1.size() - n; i++) {
    vector2.push_back(vector1[i]);
  }
  for (i = 0; i < n; i++) {
    vector2.push_back(vector1[vector1.size() - n + i]);
  }
  for (i = 0; i < vector1.size(); i++) {
    std::cout << vector2[i] << " ";
  }