#include <vector>
#include <algorithm>
#include <iostream>
 
int main() {
  int x[] = {1,2,3,4,5,6,7,8,9,10};
  int A[] = {3,4,5,6};
  int B[] = {5,6,7,8};
 
  std::vector<int> array;
  std::copy_if(std::begin(x),std::end(x), std::back_inserter(array), [&A,&B](int n){
    return std::find(std::begin(A),std::end(A),n) != std::end(A) ||
           std::find(std::begin(B),std::end(B),n) != std::end(B);
  });
 
  std::cout << "[ ";
  for(auto n: array) std::cout << n << ' ';
  std::cout << "]" << std::endl;
  return 0;
}
 

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