determine the sign of the number represented relative to the base vector by a standard set of residu

#include <iostream>
#include <vector>
using namespace std;


void printVec(vector<int> vc) {
  for(int i = 0; i < vc.size(); i++) {
    cout << vc[i] << ' ';
  }
}

int getObr(int x, int n) {
  for(int i = 1; i < n; i++) {
    if(i * x % n == 1) {
      return i;
    }
  }
  return 0;
}

int main()
{
  int n;
  cin >> n;
  vector<int> b, x;
  for(int i = 0; i < n; i++) {
    int cur;
    cin >> cur;
    b.push_back(cur);
  }

  for(int i = 0; i < n; i++) {
    int cur;
    cin >> cur;
    x.push_back(cur);
  }


  for(int i = 0; i < n; i++) {
    cout << "B" << i << ": ";
    printVec(b);
    cout << '\n';
    cout << "X" << i << ": ";
    printVec(x);
    cout << '\n';

    int q = x[0];
    int m1 = b[0];
    x.erase(x.begin());
    b.erase(b.begin());
    for(int i = 0; i < x.size(); i++) {
      x[i] = ((((x[i] - q) + b[i]) % b[i]) + b[i]) % b[i];
    }

    cout << "X" << i << " - " << q << ": ";
    printVec(x);
    cout << '\n';

    cout << m1 << "^-1 (mod b) = ";
    for(int i = 0; i < b.size(); i++) {
        cout << getObr(m1, b[i]) << " ";
    }

    cout << '\n';

    for(int i = 0; i < x.size(); i++) {
      x[i] = ((((x[i] * getObr(m1, b[i])) + b[i]) % b[i]) + b[i]) % b[i];
    }
    cout << '\n';
    cout << '\n';
  }
    cout << "End";
    return 0;
}