Submission #1502027

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Source Code Expand

#include <iostream>

constexpr auto P = static_cast<int>(1e9 + 7);

class modP {
private:
  int i;

public:
  modP(int i) noexcept : i(i % P) {}
  modP operator-(int b) { return (i - b) % P; }
  modP operator*(modP b) { return static_cast<int64_t>(i) * b.i % P; }
  modP factorial() {
		if(i == 0 || i==1 ) return 1;
		return (*this - 1).factorial() * *this; }
  friend std::ostream & operator<< (std::ostream & ostr, const modP &i);
};

std::ostream & operator<< (std::ostream& ostr, const modP& i){
  return ostr << i.i;
}

int main(void) {
  int N;
  std::cin >> N;
	std::cout << modP(N).factorial();
  return 0;
}

Submission Info

Judge Result