#include <iomanip>
#include <iostream>
#include <sstream>
#include <string>
#include <vector>
 
std::string hex_representation(const std::vector<int>& v) {
  std::stringstream stream;
  for (const auto num : v) {
    stream << "0x" << std::hex << std::setw(2) << std::setfill('0') << num
           << ' ';
  }
  return stream.str();
}
 
int main(int argc, char* argv[]) {
  std::vector<int> v = {1, 2, 3, 10, 11, 12};
  const auto hex_str = hex_representation(v);
  std::cout << hex_str << '\n';
  return 0;
}
 

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