3499 幸运数字

3499 幸运数字

⭐️难度：困难
🌟考点：2023、模拟、枚举、省赛
📖

📚

import java.util.*;

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

        int cnt = 0;
        for (long i = 1; ; i++) {
            if(cnt == 2023) break;
            if(check10(i) && check2(i) && check8(i) && check16(i)) {
                cnt ++;
                System.out.print(" cnt:" + cnt);
                System.out.println(" i:" + i);
            }
        }
    }
 	// 十进制
    static boolean check10(long x){
        String num = "" + x;
        int sum = 0;
        for (int i = 0; i < num.length(); i++) {
            sum += (num.charAt(i) - '0');
        }
//        System.out.println(" sum:"+sum);
        if(x % sum == 0) return true;
        else return false;
    }
    // 二进制
    static boolean check2(long x){
        String num = Long.toBinaryString(x);
        int sum = 0;
        for (int i = 0; i < num.length(); i++) {
            sum += (num.charAt(i) - '0');
        }
//        System.out.println(" sum:"+sum);
        if(x % sum == 0) return true;
        else return false;
    }
    // 八进制
    static boolean check8(long x){
        String num = Long.toOctalString(x);
        int sum = 0;
        for (int i = 0; i < num.length(); i++) {
            sum += (num.charAt(i) - '0');
        }
//        System.out.println(" sum:"+sum);
        if(x % sum == 0) return true;
        else return false;
    }
    // 十六进制
    static boolean check16(long x){
        String num = Long.toHexString(x);
        int sum = 0;
        for (int i = 0; i < num.length(); i++) {
            if(num.charAt(i) >= 'a' && num.charAt(i) <= 'f'){
                sum = sum + num.charAt(i) - 'a' + 10;
            }
            if(num.charAt(i) >= '0' && num.charAt(i) <= '9'){
                sum = sum + num.charAt(i) - '0';
            }
        }
//        System.out.println(" sum:"+sum);
        if(x % sum == 0) return true;
        else return false;
    }
}

除了16进制有点特别，因为10代表a，所以要取十进制数应该是-'a'+10

简单的题目往往采用最朴素的做法