//
// Created by maximilian on 2/9/24.
//

#ifndef ENDGAME_ANALYZER_FACTORIAL_H
#define ENDGAME_ANALYZER_FACTORIAL_H

#include <cstdint>

namespace Factorial {
  inline std::uint64_t factorial(std::size_t n)
  {
    static const std::uint64_t table[] = {
      1,
      1 ,
      2 ,
      6 ,
      24 ,
      120 ,
      720 ,
      5040 ,
      40320 ,
      362880 ,
      3628800 ,
      39916800 ,
      479001600 ,
      6227020800 ,
      87178291200 ,
      1307674368000 ,
      20922789888000 ,
      355687428096000 ,
      6402373705728000 ,
      121645100408832000 ,
      2432902008176640000 ,
    };
    assert(n <= 20);
    return table[n];
  }
}


#endif //ENDGAME_ANALYZER_FACTORIAL_H