全ACGO最短题解

#include<iostream>
using namespace std;bool is_prime(int n) {if (n <= 1) return false;if (n == 2 || n == 3) return true;if (n % 2 == 0 || n % 3 == 0) return false;for (int i = 5; i * i <= n; i += 6) {if (n % i == 0 || n % (i + 2) == 0) return false;}return true;}int main() {int n;cin >> n;if (is_prime(n)) cout << "Yes" << endl;else cout << "No" << endl;return 0;}