1558 找素数

1558 找素数

⭐️难度：中等
🌟考点：质数
📖

📚

import java.util.Scanner;
import java.util.Arrays;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();


        int count = 0;
        for (int i = a; i <= b; i++) {
            if(check(i)){
                count++;
            }
        }
        System.out.println(count);
    }

    static boolean check(int x){
        if(x<=1) return false;
        if(x == 2 || x == 3) return true;
        if(x % 2 == 0 || x % 3 == 0) return false;
        for (int i = 5; i * i <= x ; i += 6) {
            if(x % i == 0 || x % (i + 2) == 0){
                return false;
            }
        }
        return true;
    }
}

最后一个样例：2142483647 2143483647，
死活过不了