Function detect_solve_duplicates

library/src/solve_board.cpp:282–308

auto detect_solve_duplicates(
  const Boards& bds,
  vector<int>& uniques,
  vector<int>& crossrefs) -> void
{
  const unsigned nu = static_cast<unsigned>(bds.no_of_boards);

  uniques.clear();
  crossrefs.resize(nu);

  for (unsigned i = 0; i < nu; i++)
    crossrefs[i] = -1;

  for (unsigned i = 0; i < nu; i++)
  {
    if (crossrefs[i] != -1)
      continue;

    uniques.push_back(static_cast<int>(i));

    for (unsigned index = i+1; index < nu; index++)
    {
      if (same_board(bds, i, index))
        crossrefs[index] = static_cast<int>(i);
    }
  }
}


auto same_board(