// Return the score for a mastermind guess.

#define CATCH_CONFIG_MAIN
#include <catch.hpp>

#include <string>
#include <range/v3/all.hpp>
#include <unordered_set>

struct Score {
  int hits;
  int pseudo;

  bool operator==(const Score& rhs) const {
    return hits == rhs.hits && pseudo == rhs.pseudo;
  }
};

Score score(const std::string& board, const std::string& guess) {
  std::unordered_set<char> balls{board.cbegin(), board.cend()};
  Score ret{};
  
  for (const auto& pair: ranges::view::zip(board, guess)) {
    if (pair.first == pair.second) {
      ret.hits++;
    } else if (balls.count(pair.second) != 0) {
      ret.pseudo++;
    }
  }
  return ret;
}

TEST_CASE("cc19.5", "mastermind") {
  CHECK((score("rggb", "yrgb") == Score{2, 1}));
}