Find the next - C++

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

void FindNext(int a[], int b[], int n, int q)
{
  unordered_set<int> seen(a, a+n);
  
  for(int i = 0; i < q; ++i)
  {
    int nextVal = b[i] + 1;
    if(seen.find(nextVal) != seen.end())
      ++nextVal;
      
    b[i] = nextVal;
  }
  
  for(int i = 0; i < q; ++i)
    cout << b[i] << " ";
}

int main() 
{
  int n, q;
  cin >> n >> q;
  
  int a[n];
  for(int i = 0; i < n; ++i)
    cin >> a[i];
    
  int b[q];
  for(int i = 0; i < q; ++i)
    cin >> b[i];
  
  FindNext(a, b, n, q);
  
  return 0;
}